Optical lens system for photography, image capture unit and electronic device

Abstract

Optical lens system for photography with eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fifth lens element (E5) has a negative refractive power, the image-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, the object-side surface of the seventh lens element (E7) is convex in a paraxial region thereof, the image-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, the image-side surface of the seventh lens element (E7) has at least one inflection point (P), the eighth lens element (E8) has a negative refractive power, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, the image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) has at least one inflection point (P); where the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fifth lens element (E5) is V5, the axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67, the axial distance between the seventh lens element (E7) and the eighth lens element (E8) is T78, and the following conditions are met: − 2.50 < R 14 / R 1 < 1.10 ; 0.20 < V5 / V3 < 0.70 ; and 0 < T 67 / T 78 < 0.60.

Description

BACKGROUND Subject area

[0001] The present disclosure relates to an optical lens system for photography, an image acquisition unit and an electronic device, in particular an optical lens system for photography and an image acquisition unit that can be used in an electronic device. Description of related technology

[0002] With the development of semiconductor manufacturing technology, the performance of image sensors has improved and their pixel size has decreased. Therefore, high image quality is now one of the essential features of an optical system.

[0003] Furthermore, due to rapid technological advancements, electronic devices equipped with optical systems are increasingly becoming multifunctional for various applications, thereby raising the bar for the functionality of these optical systems. However, for a conventional optical system, it is challenging to strike a balance between requirements such as high image quality, low sensitivity, appropriate aperture, miniaturization, and a desirable field of view. SUMMARY

[0004] According to one aspect of the present disclosure, an optical lens system for photography comprises eight lens elements. The eight lens elements are, in order from an object side to an image side along a ray path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0005] Preferably, the fifth lens element has a negative refractive power. Preferably, the image-side surface of the sixth lens element is convex in a paraxial region. Preferably, the seventh lens element has a positive refractive power. Preferably, the object-side surface of the seventh lens element is convex in a paraxial region. Preferably, the image-side surface of the seventh lens element is concave in a paraxial region. Preferably, the image-side surface of the seventh lens element has at least one inflection point. Preferably, the eighth lens element has a negative refractive power. Preferably, the object-side surface of the eighth lens element is convex in a paraxial region. Preferably, the image-side surface of the eighth lens element is concave in a paraxial region. Preferably, the image-side surface of the eighth lens element has at least one inflection point.

[0006] If the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the seventh lens element is R14, the Abbe number of the third lens element is V3, the Abbe number of the fifth lens element is V5, the axial distance between the sixth and seventh lens elements is T67, and the axial distance between the seventh and eighth lens elements is T78, then the following conditions are preferably met: -2.50 <R14 / R1<1,10; 0.20 <V5 / V3<0,70; und 0 <T67 / T78<0,60.

[0007] According to another aspect of the present disclosure, an optical lens system for photography comprises eight lens elements. The eight lens elements are, in order from an object side to an image side along a ray path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0008] Preferably, the third lens element has a positive refractive power. Preferably, the image-side surface of the sixth lens element is convex in a paraxial region. Preferably, the seventh lens element has a positive refractive power. Preferably, the object-side surface of the seventh lens element is convex in a paraxial region. Preferably, the image-side surface of the seventh lens element is concave in a paraxial region. Preferably, the object-side surface of the seventh lens element has at least one inflection point. Preferably, the eighth lens element has a negative refractive power. Preferably, the object-side surface of the eighth lens element is convex in a paraxial region. Preferably, the image-side surface of the eighth lens element is concave in a paraxial region.

[0009] If the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the seventh lens element is R14, the central thickness of the fifth lens element is CT5, the central thickness of the sixth lens element is CT6, the central thickness of the seventh lens element is CT7, the axial distance between the fifth and sixth lens elements is T56, and the maximum value of all axial distances between each of all adjacent lens elements of the optical lens system for photography is ATmax, then the following conditions are preferably met: -2.00 <R14 / R1<1,00; 0.10<(CT5+T56) / CT6<0.90; and 0.40 <ATmax / CT7<2,20.

[0010] According to another aspect of the present disclosure, an image acquisition unit comprises the aforementioned optical lens system for photography and an image sensor, wherein the image sensor is arranged on an image surface of the optical lens system for photography.

[0011] According to another aspect of the present disclosure, an electronic device comprises an image acquisition unit. The image acquisition unit comprises the aforementioned optical lens system for photography and an image sensor, wherein the image sensor is arranged on an image surface of the optical lens system for photography. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The disclosure can be better understood by reading the following detailed description of the embodiments with reference to the accompanying drawings: Fig.Figure 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure; Fig. Figure 2 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the first embodiment; Fig. Figure 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure; Fig. Figure 4 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the second embodiment; Fig. Figure 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure; Fig. Figure 6 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 3rd embodiment; Fig.Figure 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure; Fig. Figure 8 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 4th embodiment; Fig. Figure 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure; Fig. Figure 10 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 5th embodiment; Fig. Figure 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure; Fig. Figure 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 6th embodiment; Fig.Figure 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure; Fig. Figure 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 7th embodiment; Fig. Figure 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure; Fig. Figure 16 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 8th embodiment; Fig. Figure 17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure; Fig. Figure 18 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 9th embodiment; Fig.Figure 19 is a perspective view of an image acquisition unit according to the 10th embodiment of the present disclosure; Fig. Figure 20 is a schematic view of an electronic device according to the 11th embodiment of the present disclosure; Fig. Figure 21 is another schematic view of the electronic device in Fig. 20; Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Fig. Figure 23 is another perspective view of the electronic device in Fig. 22; Fig. 24 is a block diagram of the electronic device in Fig. 22; Fig. Figure 25 is a perspective view of an electronic device according to the 13th embodiment of the present disclosure; Fig.Figure 26 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure; Fig. Figure 27 is a schematic view of an electronic device according to the 15th embodiment of the present disclosure; Fig. Figure 28 is a schematic view of an electronic device according to the 16th embodiment of the present disclosure; Fig. Figure 29 shows a schematic view of inflection points and critical points on lens surfaces according to the first embodiment of the present disclosure; Fig. Figure 30 shows a schematic view of ET6, ET7, ET8, ET67, ET78, SAG3R1, SAG3R2, SAG7R2, Y6R1 and Y7R2 according to the first embodiment of the present disclosure; and Fig. Figure 31 shows a schematic view of a configuration of a light deflection element in an optical lens system for photography according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0013] An optical lens system for photography comprises eight lens elements. These eight lens elements, in order from one side of the object to the other along a ray path, are: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements of the optical lens system for photography has an object-side surface facing the object and an image-side surface facing the image.

[0014] The image-side surface of the second lens element can be concave in a paraxial region. Therefore, it is advantageous to control the shape of the image-side surface of the second lens element in such a way as to compensate for spherical aberration and coma caused by the first lens element.

[0015] The third lens element can have a positive refractive power. Therefore, it is advantageous for focusing light rays incident at the object-side end from large viewing angles, thus preventing excessive angles of incidence that can lead to light scattering. The image-side surface of the third lens element can be convex in a paraxial region. This is advantageous for improving the focusing ability of the third lens element and thereby facilitating a reduction in size and weight.

[0016] The object-side surface of the fourth lens element can be convex in a paraxial region. Therefore, it is advantageous for focusing light and for working in conjunction with the front and rear lens elements to compensate for the direction of light propagation.

[0017] The fifth lens element can have a negative refractive power. Therefore, it is advantageous for balancing the overall distribution of refractive power and correcting aberrations caused by reduction in size.

[0018] The sixth lens element can have a positive refractive power. Therefore, it is advantageous for improving the light focusing capability at the image-side end of the optical lens system for photography, thus effectively controlling the light path. The image-side surface of the sixth lens element can be convex in a paraxial region. Therefore, it is advantageous for optimizing the light refraction in the optical lens system for photography according to the specifications required by the application device.

[0019] The seventh lens element can have a positive refractive power. Therefore, it is advantageous to reduce the length at the image-side end of the optical lens system for photography, thus preventing the overall path length from becoming too long. The object-side surface of the seventh lens element can be convex in a paraxial region. Therefore, it is advantageous to increase the positive refractive power of the seventh lens element and correct astigmatism. The image-side surface of the seventh lens element can be concave in a paraxial region. Therefore, it is advantageous to adjust the direction of refraction of light at the seventh lens element to enlarge the image area.

[0020] The eighth lens element can have a negative refractive power. Therefore, it is advantageous to compensate for the refractive power at the image-side end of the optical lens system for photography, to improve the light focusing quality at the image surface across different fields of view, and to reduce aberrations. The object-side surface of the eighth lens element can be convex in a paraxial region. Therefore, it is advantageous to focus light rays to prevent non-imaging light from being reflected within the lens. The image-side surface of the eighth lens element can be concave in a paraxial region. Therefore, it is advantageous to adjust the surface shape and refractive power of the eighth lens element to correct field curvature and distortion and to reduce the back focal length.

[0021] According to the present disclosure, the object-side surface of the seventh lens element can have at least one inflection point. Therefore, it is advantageous to control the angle of incidence of the light on the object-side surface of the seventh lens element in such a way as to reduce surface reflections of rays in the peripheral field. The image-side surface of the seventh lens element can have at least one inflection point. Therefore, it is advantageous to reduce the size and correct off-axis aberrations. The image-side surface of the eighth lens element has at least one inflection point. Therefore, it is advantageous to improve the light focusing quality over different fields of view while maintaining miniaturization of the lens. See Fig.29, which shows a schematic view of the inflection points P of the object-side surface of the seventh lens element E7, the image-side surface of the seventh lens element E7 and the image-side surface of the eighth lens element E8 according to the 1st embodiment of the present disclosure. Fig.Figure 29 shows, in the first embodiment of the present disclosure, the inflection points P, which are arranged on the object-side surface of the seventh lens element E7, the image-side surface of the seventh lens element E7 and the image-side surface of the eighth lens element E8, together with the inflection points P on the object-side surface and the image-side surface of the first lens element E1, the object-side surface of the second lens element E2, the image-side surface of the third lens element E3, the object-side surface of the fourth lens element E4, the object-side surface and the image-side surface of the fifth lens element E5, the object-side surface and the image-side surface of the sixth lens element E6 and the object-side surface of the eighth lens element E8 as an exemplary representation.However, in various embodiments of the present disclosure, each of the lens surfaces of the lens elements can have one or more inflection points.

[0022] According to the present disclosure, the object-side surface of the seventh lens element can have at least one critical point in an off-axis region thereof. This is advantageous for further improving design flexibility and reducing stray light formation. The image-side surface of the eighth lens element can also have at least one critical point in an off-axis region thereof. This is advantageous for the circumferential shape of the image-side surface of the eighth lens element to exhibit a certain degree of variation, thereby improving the circumferential illuminance and image quality on the image surface. See Fig.29, which shows a schematic view of the critical points C in an off-axis region of the object-side surface of the seventh lens element E7 and the image-side surface of the eighth lens element E8 according to the 1st embodiment of the present disclosure. Fig.Figure 29 shows, in the first embodiment of the present disclosure, the critical points C, which are arranged in an off-axis region on the object-side surface of the seventh lens element E7 and the image-side surface of the eighth lens element E8, together with the critical points C in an off-axis region on the image-side surface of the fifth lens element E5, the object-side surface of the sixth lens element E6, the image-side surface of the seventh lens element E7, and the object-side surface of the eighth lens element E8, as an exemplary illustration. However, in various embodiments of the present disclosure, each of the lens surfaces of the lens elements may have one or more critical points in an off-axis region thereof.

[0023] According to the present disclosure, each of at least four lens elements in the optical lens system for photography can have a refractive index of less than 1.75. In other words, at least four lens elements in the optical lens system for photography can each have a refractive index of less than 1.75. This is advantageous for adapting to the overall design, allowing the selected materials to better meet the application requirements of the product. Furthermore, at least five lens elements with a refractive index of less than 1.75 can also be present in the optical lens system for photography. Additionally, at least six lens elements with a refractive index of less than 1.75 can also be present in the optical lens system for photography.

[0024] According to the present disclosure, at least five lens elements in the optical lens system for photography can be made of plastic material. In other words, among all the lens elements in the optical lens system for photography, at least five lens elements can be made of plastic material. Therefore, this is advantageous in order to effectively reduce the lens weight and lessen the manufacturing difficulties of aspherical lens elements.

[0025] If the radius of curvature of the object-side surface of the first lens element is R1 and the radius of curvature of the image-side surface of the seventh lens element is R14, the following condition can be met: -2.50 < R14 / R1 < 1.10. Therefore, it is advantageous to adjust the light path, correct spherical aberrations and astigmatism, and thereby improve the image resolution and optical performance of the lens. Furthermore, the following conditions can also be met: -2.00 < R14 / R1 < 1.00. Furthermore, the following conditions can also be met: -1.80 < R14 / R1 < 1.00. Furthermore, the following conditions can also be met: -1.50 < R14 / R1 < 0.95. Furthermore, the following condition can also be met: -1.34 ≤ R14 / R1 ≤ 0.81.

[0026] If the Abbe number of the third lens element is V3 and the Abbe number of the fifth lens element is V5, the following condition can be met: 0.20 < V5 / V3 < 0.70. Therefore, this is advantageous for effectively correcting the focal point positions of light in different wavelength ranges to improve sharpness and color contrast, thus optimizing image quality. Furthermore, the following conditions can also be met: 0.25 < V5 / V3 < 0.60. Additionally, the following conditions can also be met: 0.28 < V5 / V3 < 0.55. Furthermore, the following condition can also be met: 0.33 ≤ V5 / V3 ≤ 0.51.

[0027] If the axial distance between the sixth and seventh lens elements is T67, and the axial distance between the seventh and eighth lens elements is T78, the following condition can be met: 0 < T67 / T78 < 0.60. Therefore, it is advantageous to adjust the spatial configuration of the seventh lens element in accordance with the overall design to reduce manufacturing tolerances and image field curvature. Furthermore, the following conditions can also be met: 0 < T67 / T78 < 0.50. Furthermore, the following conditions can also be met: 0.01 < T67 / T78 < 0.40. Furthermore, the following conditions can also be met: 0.02 ≤ T67 / T78 ≤ 0.34. Furthermore, the following condition can also be met: 0.01 < T67 / T78 < 0.20.

[0028] If the central thickness of the fifth lens element is CT5, the central thickness of the sixth lens element is CT6, and the axial distance between the fifth and sixth lens elements is T56, the following condition can be met: 0.10 < (CT5+T56) / CT6 < 0.90. Therefore, it is advantageous to adjust the ratio of the central thickness and the axial distance of the lens elements to improve manufacturing yield. Furthermore, the following conditions can also be met: 0.10 < (CT5+T56) / CT6 < 0.80. Additionally, the following conditions can also be met: 0.15 < (CT5+T56) / CT6 < 0.70. Furthermore, the following condition can also be met: 0.20 < (CT5+T56) / CT6 < 0.60. Furthermore, the following condition can also be met: 0.25 ≤ (CT5+T56) / CT6 ≤ 0.51.

[0029] If the maximum value of ATmax among all axial distances between each of all adjacent lens elements of the optical lens system for photography is and the central thickness of the seventh lens element is CT7, the following condition can be met: 0.40 < ATmax / CT7 < 2.20. Therefore, this is advantageous for improving space utilization and maintaining assembly stability, thereby increasing productivity. Furthermore, the following conditions can also be met: 0.50 < ATmax / CT7 < 1.90. Additionally, the following conditions can also be met: 0.60 < ATmax / CT7 < 1.80. Furthermore, the following condition can also be met: 0.87 ≤ ATmax / CT7 ≤ 1.70.

[0030] If the axial distance between the object-side surface of the first lens element and an image surface is TL, and the focal length of the optical lens system for photography is f, the following condition can be satisfied: 1.40 < TL / f < 2.70. Therefore, it is advantageous for the optical lens system for photography to achieve a balance between the total path length and the field of view. Furthermore, the following condition can also be satisfied: 1.45 ≤ TL / f ≤ 2.36.

[0031] If the focal length of the optical lens system for photography is f, and the combined focal length of the first and second lens elements is f12, the following condition can be met: -0.50 < f / f12 < 0.50. Therefore, it is advantageous to balance the focal lengths of the first and second lens elements to regulate the light incidence at the object-side end of the optical lens system for photography. Furthermore, the following condition can also be met: -0.40 < f / f12 < 0.40.

[0032] If the Abbe number of the second lens element is V2 and the Abbe number of the third lens element is V3, the following condition can be met: 0.20 < V2 / V3 < 1.00. Therefore, it is advantageous to adjust the distribution of the lens materials to correct chromatic aberrations and thereby improve color saturation and image sharpness. Furthermore, the following condition can also be met: 0.30 < V2 / V3 < 0.90. Additionally, the following condition can also be met: 0.35 < V2 / V3 < 0.85.

[0033] If the axial distance between the first and second lens elements is T12, and the axial distance between the second and third lens elements is T23, the following condition can be satisfied: 0 < T12 / T23 < 2.00. Therefore, it is advantageous for the second lens element to interact with the front and rear lens elements to facilitate the coupling design between the lens section outside the optically effective radius and the mechanical structure. Furthermore, the following condition can also be satisfied: 0.05 < T12 / T23 < 1.80.

[0034] If the radius of curvature of the object-side surface of the fifth lens element is R9 and the radius of curvature of the object-side surface of the eighth lens element is R15, the following condition can be satisfied: 0 < |R15 / R9| < 0.80. Therefore, it is advantageous for the object-side surface of the eighth lens element to have a more curved shape in the middle section to correct distortions and reduce the overall path length. Furthermore, the following condition can also be satisfied: 0.02 < |R15 / R9| < 0.70.

[0035] If the focal length of the first lens element is f1 and the focal length of the sixth lens element is f6, the following condition can be met: -0.80 < f6 / f1 < 4.00. Therefore, it is advantageous to adjust the distribution of refractive power between the lens elements to correct aberrations. Furthermore, the following condition can also be met: -0.70 < f6 / f1 < 3.50. Additionally, the following condition can also be met: -0.65 < f6 / f1 < 3.00.

[0036] If the maximum image height of the optical lens system for photography (which can be half the diagonal length of an effective light-sensitive area of ​​an image sensor) is ImgH and the entrance pupil diameter of the optical lens system for photography is EPD, the following condition can be met: 1.45 < ImgH / EPD < 2.40. Therefore, it is advantageous to achieve a balance between aperture configuration and image surface area in the optical lens system for photography, thereby improving image quality in dynamic and low-light photography. Furthermore, the following condition can also be met: 1.55 < ImgH / EPD < 2.30. Additionally, the following condition can also be met: 1.62 ≤ ImgH / EPD ≤ 2.05.

[0037] If the radius of curvature of the image-side surface of the second lens element is R4 and the radius of curvature of the image-side surface of the third lens element is R6, the following condition can be met: -1.30 < R4 / R6 < 0.10. Therefore, this is advantageous for correcting spherical aberration and coma to improve image quality. Furthermore, the following conditions can also be met: -1.10 < R4 / R6 < 0. Additionally, the following condition can also be met: -0.95 < R4 / R6 < -0.05.

[0038] If a distance parallel to an optical axis between a position of the maximum effective radius of the image-side surface of the sixth lens element and a position of the maximum effective radius of the object-side surface of the seventh lens element is ET67, and a distance parallel to the optical axis between a position of the maximum effective radius of the image-side surface of the seventh lens element and a position of the maximum effective radius of the object-side surface of the eighth lens element is ET78, the following condition can be met: 0.05 < ET78 / ET67 < 0.65. Therefore, it is advantageous to harmonize the peripheral light paths at the image-side end of the optical lens system for photography in order to improve peripheral image quality. Furthermore, the following condition can also be met: 0.10 < ET78 / ET67 < 0.55. See [reference]. Fig.30, which shows a schematic view of ET67 and ET78 according to the 1st embodiment of the present disclosure.

[0039] If a displacement parallel to the optical axis from an axial vertex of the object-side surface of the third lens element to a position of the maximum effective radius of the object-side surface of the third lens element is SAG3R1, and a displacement parallel to the optical axis from an axial vertex of the image-side surface of the third lens element to a position of the maximum effective radius of the image-side surface of the third lens element is SAG3R2, the following condition can be satisfied: -1.00 < SAG3R1 / SAG3R2 < 0.35. Therefore, it is advantageous to adapt the design of the peripheral surface of the third lens element to facilitate light guiding and aberration correction. Furthermore, the following condition can also be satisfied: -0.80 < SAG3R1 / SAG3R2 < 0. See [reference]. Fig. Figure 30 shows a schematic view of SAG3R1 and SAG3R2 according to the first embodiment of the present disclosure. If the direction from the axial vertex of a surface to the position of the maximum effective radius of the same surface is directed towards the image side of the optical lens system for photography, the value of the displacement is positive; if the direction from the axial vertex of the surface to the position of the maximum effective radius of the same surface is directed towards the object side of the optical lens system for photography, the value of the displacement is negative.

[0040] If a displacement parallel to the optical axis from an axial vertex of the image-side surface of the seventh lens element to the position of the maximum effective radius of the image-side surface of the seventh lens element is SAG7R2, and the central thickness of the seventh lens element is CT7, the following condition can be met: -0.30 < SAG7R2 / CT7 < 1.20. Therefore, it is advantageous to effectively prevent excessive expansion of the peripheral shape on the image-side surface of the seventh lens element, thus maintaining the shape stability and manufacturing quality of the lens element. Furthermore, the following condition can also be met: -0.10 < SAG7R2 / CT7 < 1.00. Additionally, the following condition can also be met: 0 < SAG7R2 / CT7 < 0.90. See [reference]. Fig.Figure 30 shows a schematic view of SAG7R2 according to the first embodiment of the present disclosure. If the direction from the axial vertex of a surface to the position of the maximum effective radius of the same surface is directed towards the image side of the optical lens system for photography, the value of the displacement is positive; if the direction from the axial vertex of the surface to the position of the maximum effective radius of the same surface is directed towards the object side of the optical lens system for photography, the value of the displacement is negative.

[0041] If the focal length of the fifth lens element is f5 and the focal length of the sixth lens element is f6, the following condition can be met: -5.00 < f5 / f6 < 0. Therefore, it is advantageous for the refractive power of the fifth lens element and the refractive power of the sixth lens element to work together in a coordinated manner to improve the image quality of moments captured during dynamic photography. Furthermore, the following condition can also be met: -4.00 < f5 / f6 < -0.10. Additionally, the following condition can also be met: -3.60 < f5 / f6 < -0.20.

[0042] If the focal length of the first lens element is f1 and the focal length of the fifth lens element is f5, the following condition can be met: -4.00 < f5 / f1 < 0.50. Therefore, it is advantageous to optimize the focusing or diffusion of light to improve the light focusing quality across the entire field of view. Furthermore, the following condition can also be met: -3.50 < f5 / f1 < 0.40. Additionally, the following condition can also be met: -3.00 < f5 / f1 < 0.30.

[0043] If the radius of curvature of the image-side surface of the eighth lens element is R16 and the axial distance between the image-side surface of the eighth lens element and the image surface is BL, the following condition can be met: 0.60 < R16 / BL < 2.00. Therefore, it is advantageous to effectively control the rear focal length to prevent the overall focusing distance from becoming excessively long. Furthermore, the following conditions can also be met: 0.70 < R16 / BL < 1.60. Additionally, the following condition can also be met: 0.80 < R16 / BL < 1.50.

[0044] If the distance parallel to the optical axis between the position of the maximum effective radius of the object-side surface of the sixth lens element and the position of the maximum effective radius of the image-side surface of the sixth lens element is ET6, and the central thickness of the sixth lens element is CT6, the following condition can be met: 0.15 < ET6 / CT6 < 0.80. Therefore, it is advantageous to prevent deformations or distortions during manufacturing by controlling the thickness ratio via the radius of the sixth lens element, while simultaneously maintaining the manufacturability of the lens element. Furthermore, the following condition can also be met: 0.20 < ET6 / CT6 < 0.60. See [reference]. Fig. 30, which shows a schematic view of ET6 according to the 1st embodiment of the present disclosure.

[0045] If a distance parallel to the optical axis exists between the position of the maximum effective radius of the object-side surface of the seventh lens element and the position of the maximum effective radius of the image-side surface of the seventh lens element (ET7), and a distance parallel to the optical axis exists between the position of the maximum effective radius of the object-side surface of the eighth lens element and the position of the maximum effective radius of the image-side surface of the eighth lens element (ET8), the following condition can be satisfied: 0.75 < ET7 / ET8 < 2.50. Therefore, it is advantageous to balance the direction of light propagation, reduce the formation of stray light, and correct off-axis aberrations. Furthermore, the following condition can also be satisfied: 0.80 < ET7 / ET8 < 2.40. See [reference]. Fig. 30, which shows a schematic view of ET7 and ET8 according to the 1st embodiment of the present disclosure.

[0046] If the maximum effective radius of the object-side surface of the sixth lens element is Y6R1 and the maximum effective radius of the image-side surface of the seventh lens element is Y7R2, the following condition can be satisfied: 0.50 < Y6R1 / Y7R2 < 0.75. Therefore, it is advantageous to reduce the angle of refraction of the light by adjusting the proportional ratio between the optically effective radii of the sixth and seventh lens elements to prevent total internal reflection. See [reference]. Fig. 30, which shows a schematic view of Y6R1 and Y7R2 according to the 1st embodiment of the present disclosure.

[0047] According to the present disclosure, the above-mentioned features and conditions can be used in numerous combinations to achieve corresponding effects.

[0048] According to the present disclosure, the lens elements of the optical lens system for photography can be made of either glass or plastic. If the lens elements are made of glass, the refractive power distribution of the optical lens system for photography can be more flexible, and the influence on the imaging caused by changes in ambient temperature can be reduced. The glass lens element can be manufactured either by grinding or forming. If the lens elements are made of plastic, the manufacturing costs can be effectively reduced. Furthermore, the surfaces of each lens element can be spherical or aspherical. Spherical lens elements are easy to manufacture.The design of aspherical lens elements allows for more control variables to eliminate aberrations and reduce the required number of lens elements, effectively shortening the overall path length of the optical lens system for photography. Additionally, the aspherical surfaces can be formed by plastic injection molding or glass forming.

[0049] According to the present disclosure, if a lens surface is aspherical, it means that the lens surface has an aspherical shape over its entire optically effective area or part(s) thereof.

[0050] According to the present disclosure, the material of one or more lens elements can optionally contain an additive that produces light absorption and interference effects and modifies the transmittance of the lens elements in a specific wavelength range to reduce unwanted scattered light or color deviations. For example, the additive can optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red light and / or near-infrared light; or it can optionally filter out light in the wavelength range of 350 nm to 450 nm to prevent excessive blue light and / or near-ultraviolet light from interfering with the final image. The additive can be homogeneously mixed with a plastic material to be used for the production of a lens element from the mixed material by injection molding.Furthermore, the additive can be applied to the lens surfaces to achieve the effects mentioned above.

[0051] According to the present disclosure, both an object-side surface and an image-side surface have a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axis region refers to the region of the surface that is farther from the paraxial region. In particular, unless otherwise specified, if the lens element has a convex surface, the surface in its paraxial region is convex, and if the lens element has a concave surface, the surface in its paraxial region is concave. If a region of refractive power, radius of curvature, or focal point of a lens element is not defined, it means that the region of refractive power, radius of curvature, or focal point of the lens element is located in its paraxial region.

[0052] According to the present disclosure, an inflection point is a point on the surface of the lens element where the surface changes from concave to convex or vice versa. A critical point is a non-axial point on the lens surface where its tangent is perpendicular to the optical axis.

[0053] According to the present disclosure, the image surface of the optical lens system for photography, based on the corresponding image sensor, can be flat or curved, in particular a curved surface that is concave towards the object side of the optical lens system.

[0054] According to the present disclosure, an image correction unit, such as an image field flattener, can optionally be arranged between the lens element closest to the image-side surface of the optical lens system used for photography and the image surface to correct aberrations such as field curvature. The optical properties of the image correction unit, such as curvature, thickness, refractive index, position, and surface shape (convex or concave surface with spherical, aspherical, diffractive, or Fresnel types), can be adapted according to the design of the image acquisition unit. In general, a preferred image correction unit is, for example, a thin transparent element with a concave object-side surface and a planar image-side surface, wherein the thin transparent element is arranged near the image surface.

[0055] According to the present disclosure, at least one light deflection element, such as a prism or a mirror, can optionally be provided between an imaged object and the image surface on the beam path, and the surface shape of the prism or mirror can be planar, spherical, aspherical, or free-form, so that the optical lens system for photography can be more flexible in its spatial arrangement, so that the miniaturization of an electronic device is not limited by the overall path length of the optical lens system. See in particular Fig. Figure 31, which shows a schematic view of a configuration of a light deflection element in an optical lens system according to an embodiment of the present disclosure. Fig.31 The optical lens system for photography can have, in the sequence from a photographed object (not shown in the figures) to an image surface IMG along a beam path, a first optical axis OA1, a light deflecting element LF and a second optical axis OA2. The light deflecting element LF can be arranged between the photographed object and a lens group LG of the optical lens system for photography, as shown in Fig. Figure 31 shows that the optical lens system for photography can optionally be provided with two or more light deflection elements, and the present disclosure is not limited to the types, numbers or positions of the light deflection elements of the embodiments disclosed in the aforementioned figures.

[0056] According to the present disclosure, the optical lens system for photography can comprise at least one aperture, such as an aperture diaphragm, a glare diaphragm, or a field diaphragm. The glare diaphragm or field diaphragm can be arranged between an imaged object and the first lens element, between adjacent lens elements, or between the last lens element and the image surface, and serves to eliminate stray light and thereby improve image quality.

[0057] According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or a central diaphragm. A front diaphragm, positioned between an imaged object and the first lens element, can provide a greater distance between the exit pupil of the optical lens system used for photography and the image surface, thus creating a telecentric effect and improving the image acquisition efficiency of an image sensor (for example, CCD or CMOS). A central diaphragm, positioned between the first lens element and the image surface, is advantageous for increasing the viewing angle of the optical lens system used for photography, thereby providing a wider field of view.

[0058] According to the present disclosure, the optical lens system for photography can include an aperture control unit. The aperture control unit can be a mechanical component or a light modulator that can control the size and shape of the aperture by means of electricity or electrical signals. The mechanical component can include a movable element, such as a louvered arrangement or a light-shielding film. The light modulator can include a shielding element, such as a filter, an electrochromic material, or a liquid crystal layer. The aperture control unit controls the amount of incident light or the exposure time to improve the ability to adjust image quality. Furthermore, the aperture control unit can be the aperture diaphragm of the present disclosure, which changes the f-number to achieve various image effects, such as depth of field or lens speed.

[0059] According to the present disclosure, the optical lens system for photography can comprise one or more optical elements for limiting the shape of the light passing through the optical lens system for photography. Each optical element can be, but is not limited to, a filter, a polarizer, etc., and each optical element can be, but is not limited to, a single element, a composite component, a thin layer, etc. The optical element can be arranged on the object side or the image side of the optical lens system for photography, or between two adjacent lens elements, in order to transmit light in a specific shape and thus meet application requirements.

[0060] According to the present disclosure, the optical lens system for photography can comprise at least one optical lens element, an optical element, or a support having at least one surface with a low-reflection layer. The low-reflection layer can effectively reduce stray light resulting from light reflection at the interface. The low-reflection layer can be located in an optically ineffective region of an object-side surface, an image-side surface of the optical lens element, or an interface between the object-side and image-side surfaces. The optical element can be a light-blocking element, an annular spacer, a tube element, a cover glass, a blue glass, a filter, a color filter, a beam deflection element (e.g., a reflecting element), a prism, a mirror, etc.The support can be a base for supporting a lens assembly, a microlens arranged on an image sensor, a substrate surrounding the image sensor, a glass plate to protect the image sensor, etc.

[0061] According to the present disclosure, the optical lens system for photography can further comprise a light-blocking element. The light-blocking element can have a non-circular aperture, and the non-circular aperture can have different effective radii in different directions perpendicular to the optical axis. Therefore, it is advantageous for the light-blocking element to be coordinated with the shape of non-circular lens elements or aperture diaphragms in order to reduce the size of the optical lens system for photography and to fully utilize the light passing through the non-circular lens elements or aperture diaphragms, thereby reducing stray light. In addition, the light-blocking element can be provided with a wave-like or serrated structure on the circumference of an inner aperture section thereof.

[0062] According to the present disclosure, the object side and the image side are defined according to the direction of the optical axis, and the axial optical data are calculated along the optical axis. If the optical axis is deflected by a reflecting element, the axial optical data are also calculated along the deflected optical axis.

[0063] According to the above description of the present disclosure, the following specific embodiments are also provided. 1. Design Fig. Figure 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure. Fig. Figure 2 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the first embodiment. Fig.1 The image acquisition unit 1 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in the order from an object side to an image side along a ray path, a first lens element E1, a second lens element E2, an aperture diaphragm ST, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0064] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of glass and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has one inflection point. The image-side surface of the first lens element E1 has three inflection points.

[0065] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point.

[0066] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0067] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has an inflection point.

[0068] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has one inflection point. The image-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three critical points in an off-axis region.

[0069] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has two critical points in an off-axis region.

[0070] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has a critical point in an off-axis region. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0071] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has three inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0072] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0073] The equation for the aspherical surface profiles of the above-mentioned lens elements of the first embodiment is as follows: X(Y)=(Y2 / R) / (1+sqrt(1−(1+k)×(Y / R)2))+∑i(Ai)×(Yi) , where X is the displacement parallel to the optical axis from an axial vertex on the aspherical surface to a point at a distance Y from the optical axis on the aspherical surface; Y is the vertical distance from the point on the aspherical surface to the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th aspherical coefficient, where in the embodiments i may be, among others, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 and 28.

[0074] In the optical lens system for photographing the image acquisition unit 1 according to the 1st embodiment, if a focal length of the optical lens system for photography is f, an aperture number of the optical lens system is Fno, and half of a maximum field of view of the optical lens system is HFOV, these parameters have the following values: f = 7.08 millimeters (mm), Fno = 1.83, and HFOV = 44.5 degrees.

[0075] If the maximum field of view of the optical lens system for photography is FOV, then the following condition is met: FOV = 89.0 degrees.

[0076] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG TL is and the focal length of the optical lens system for photography is f, then the following condition is met: TL / f = 2.11.

[0077] If the maximum image height of the optical lens system for photography is ImgH and the entrance pupil diameter of the optical lens system for photography is EPD, then the following condition is met: ImgH / EPD = 1.82.

[0078] If the focal length of the optical lens system for photography is f and a combined focal length of the first lens element E1 and the second lens element E2 is f12, then the following condition is met: f / f12 = -0.26.

[0079] If the focal length of the first lens element E1 is f1 and the focal length of the fifth lens element E5 is f5, then the following condition is met: f5 / f1 = -0.03.

[0080] If the focal length of the first lens element E1 is f1 and the focal length of the sixth lens element E6 is f6, then the following condition is met: f6 / f1 = 0.03.

[0081] If the focal length of the fifth lens element E5 is f5 and the focal length of the sixth lens element E6 is f6, then the following condition is met: f5 / f6 = -1.05.

[0082] If the radius of curvature of the object-side surface of the first lens element E1 is R1 and the radius of curvature of the image-side surface of the seventh lens element E7 is R14, then the following condition is met: R14 / R1 = 0.07.

[0083] If the radius of curvature of the image-side surface of the second lens element E2 is R4 and the radius of curvature of the image-side surface of the third lens element E3 is R6, then the following condition is met: R4 / R6 = -0.17.

[0084] If the radius of curvature of the object-side surface of the fifth lens element E5 is R9 and the radius of curvature of the object-side surface of the eighth lens element E8 is R15, then the following condition is satisfied: |R15 / R9| = 0.48.

[0085] If the radius of curvature of the image-side surface of the eighth lens element E8 is R16 and the axial distance between the image-side surface of the eighth lens element E8 and the image surface IMG is BL, the following condition is met: R16 / BL = 1.14.

[0086] If the axial distance between the first lens element E1 and the second lens element E2 is T12, and the axial distance between the second lens element E2 and the third lens element E3 is T23, then the following condition is met: T12 / T23 = 0.29. In this embodiment, an axial distance between two adjacent lens elements is a distance in a paraxial region between two adjacent lens surfaces of the two adjacent lens elements.

[0087] If the central thickness of the fifth lens element E5 is CT5, the central thickness of the sixth lens element E6 is CT6, and the axial distance between the fifth lens element E5 and the sixth lens element E6 is T56, then the following condition is met: (CT5+T56) / CT6 = 0.25.

[0088] If a maximum value among all axial distances between each of all adjacent lens elements of the optical lens system for photography is ATmax, and a central thickness of the seventh lens element E7 is CT7, then the following condition is met: ATmax / CT7 = 1.55. In this embodiment, from the first lens element E1 to the eighth lens element E8, the axial distance between the fourth lens element E4 and the fifth lens element E5 is greater than the axial distances between any other pair of adjacent lens elements, and ATmax is equal to the axial distance between the fourth lens element E4 and the fifth lens element E5.

[0089] If the axial distance between the sixth lens element E6 and the seventh lens element E7 is T67 and the axial distance between the seventh lens element E7 and the eighth lens element E8 is T78, then the following condition is met: T67 / T78 = 0.02.

[0090] If the Abbe number of the second lens element E2 is V2 and the Abbe number of the third lens element E3 is V3, then the following condition is satisfied: V2 / V3 = 0.67.

[0091] If the Abbe number of the third lens element E3 is V3 and an Abbe number of the fifth lens element E5 is V5, then the following condition is satisfied: V5 / V3 = 0.36.

[0092] If a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the sixth lens element E6 and a position of the maximum effective radius of the image-side surface of the sixth lens element E6 is ET6 and the central thickness of the sixth lens element E6 is CT6, then the following condition is satisfied: ET6 / CT6 = 0.32.

[0093] If a distance parallel to the optical axis between the position of the maximum effective radius of the image-side surface of the sixth lens element E6 and a position of the maximum effective radius of the object-side surface of the seventh lens element E7 is ET67, and a distance parallel to the optical axis between a position of the maximum effective radius of the image-side surface of the seventh lens element E7 and a position of the maximum effective radius of the object-side surface of the eighth lens element E8 is ET78, then the following condition is satisfied: ET78 / ET67 = 0.20.

[0094] If a distance parallel to the optical axis exists between the position of the maximum effective radius of the object-side surface of the seventh lens element E7 and the position of the maximum effective radius of the image-side surface of the seventh lens element E7 ET7, and a distance parallel to the optical axis exists between the position of the maximum effective radius of the object-side surface of the eighth lens element E8 and a position of the maximum effective radius of the image-side surface of the eighth lens element E8 ET8, the following condition is satisfied: ET7 / ET8=0.88.

[0095] If the maximum effective radius of the object-side surface of the sixth lens element is E6 Y6R1 and the maximum effective radius of the image-side surface of the seventh lens element is E7 Y7R2, then the following condition is satisfied: Y6R1 / Y7R2=0.65.

[0096] If a displacement parallel to the optical axis from an axial vertex of the object-side surface of the third lens element E3 to a position of the maximum effective radius of the object-side surface of the third lens element E3 is SAG3R1, and a displacement parallel to the optical axis from an axial vertex of the image-side surface of the third lens element E3 to a position of the maximum effective radius of the image-side surface of the third lens element E3 is SAG3R2, the following condition is satisfied: SAG3R1 / SAG3R2 = -0.67. In this embodiment, the direction of SAG3R1 faces the image side, so the value of SAG3R1 is positive; the direction of SAG3R2 faces the object side, so the value of SAG3R2 is negative.

[0097] If a displacement parallel to the optical axis from an axial vertex of the image-side surface of the seventh lens element E7 to the position of the maximum effective radius of the image-side surface of the seventh lens element E7 is SAG7R2, and the central thickness of the seventh lens element E7 is CT7, then the following condition is met: SAG7R2 / CT7 = 0.20. In this embodiment, the direction of SAG7R2 faces the image side, so the value of SAG7R2 is positive.

[0098] The detailed optical data of the first embodiment are listed in Table 1A and the aspherical surface data in Table 1B below. TABLE 1A 1. Design f = 7.08 mm, Fno = 1.83, HFOV = 44.5 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 82,3886 (ASP) 1,510 Glass 1,589 61,2 236,69 2 200,0000 (ASP) 0,413 3 Lens 2 4,4440 (ASP) 0,802 plastic 1,566 37,4 -24,01 4 3,1305 (ASP) 1,448 5 Ape. Aperture Plano -0,039 6 Lens 3 16,8542 (ASP) 0,843 plastic 1,544 56,0 16,43 7 -18,6872 (ASP) 0,390 8 Lens 4 8,9696 (ASP) 1,149 plastic 1,544 56,0 9,46 9 -11,5299 (ASP) 0,678 10 Aperture Plano 0,750 11 Lens 5 -7,6348 (ASP) 0,450 plastic 1,660 20,4 -7,55 12 14,7001 (ASP) 0,030 13 Lens 6 12,4459 (ASP) 1,950 plastic 1,544 56,0 7,17 14 -5,3644 (ASP) 0,030 15 Lens 7 4,1619 (ASP) 0,919 plastic 1,566 37,4 25,73 16 5,3617 (ASP) 1,216 17 Lens 8 3,7011 (ASP) 0,677 plastic 1,551 44,8 -8,79 18 1,9609 (ASP) 0,900 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,526 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.772 mm. TABLE 1B Aspheric coefficients Surface # 1 2 3 4 k = 0,00000E+00 0,00000E+00 -8,99423E-01 -9,65619E-01 A4 = 2,81555704E-03 -3,66008408E-03 -2,08778293E-02 -1,33336142E-02 A6 = -1,77252485E-04 2,47515656E-03 4,56649078E-03 9,34645400E-04 A8 = 4,10035206E-05 -5,95215508E-04 -9,52066506E-04 2,41974852E-03 A10 = -6,65676930E-06 9,59274749E-05 1,76132973E-04 -1,92342496E-03 A12 = 6,83051635E-07 -1,00801573E-05 -2,64185196E-05 8,63517027E-04 A14 = -4,13060557E-08 6,54389963E-07 2,71029646E-06 -2,39233012E-04 A16 = 1,35354246E-09 -2,37387520E-08 -1,64169466E-07 3,99703389E-05 A18 = -1,86093207E-11 3,64650991E-10 4,90805891E-09 -3,66812282E-06 A20 = - - -4,58614790E-11 1,42214291E-07 Surface # 6 7 8 9 k = 3,11903E+01 5,57632E+01 0,00000E+00 0,00000E+00 A4 = -3,94234729E-03 -1,16605676E-02 -1,28788678E-02 -8,88587303E-03 A6 = 2,78967341E-03 3,42350010E-03 1,99618682E-03 7,50041473E-04 A8 = -3,29431091E-03 -4,88192961E-04 -1,67442288E-04 -4,90159065E-04 A10 = 3,08594436E-03 -1,49731219E-04 -4,68950162E-05 2,62853510E-04 A12 = -1,78751525E-03 1,83034545E-04 2,35515908E-05 -7,66392426E-05 A14 = 6,38456803E-04 -7,81734238E-05 -4,94773089E-06 1,28187889E-05 A16 = -1,36234422E-04 1,82023041E-05 5,33245729E-07 -1,17606936E-06 A18 = 1,59139977E-05 -2,23754195E-06 -2,14694949E-08 4,71701852E-08 A20 = -7,80703640E-07 1,15269101E-07 - - Surface # 11 12 13 14 k = 0,00000E+00 -4,89200E+00 9,75561E+00 0,00000E+00 A4 = -2,34623747E-02 -8,28597059E-02 -8,03668575E-02 -9,97674561E-03 A6 = 9,43234381E-03 7,09347637E-02 7,85271831E-02 2,64852764E-03 A8 = -4,78187310E-03 -4,08503420E-02 -4,68981196E-02 -1,15802438E-03 A10 = 2,07793987E-03 1,55554245E-02 1,81042764E-02 5,88597172E-04 A12 = -5,70339297E-04 -3,99535050E-03 -4,75593074E-03 -2,21690538E-04 A14 = 9,64148900E-05 7,08601955E-04 8,71338230E-04 5,66755379E-05 A16 = -9,82644191E-06 -8,75468726E-05 -1,11644761E-04 -9,85819430E-06 A18 = 5,55008997E-07 7,44036032E-06 9,80537607E-06 1,17147964E-06 A20 = -1,33523003E-08 -4,16355551E-07 -5,61402949E-07 -9,38060338E-08 A22 = - 1,38455978E-08 1,88353074E-08 4,83934940E-09 A24 = - -2,07552066E-10 -2,80463193E-10 -1,44827614E-10 A26 = - - - 1,90183600E-12 Surface # 15 16 17 18 k = -7,57871E-01 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = 4,61449456E-04 1,36053317E-02 -5,04558483E-02 -6,40369658E-02 A6 = -2,37694489E-03 -4,81001326E-03 6,19376924E-03 1,30389368E-02 A8 = 3,52021119E-04 4,05605748E-04 6,52835210E-05 -2,18260632E-03 A10 = -9,01470427E-05 5,98255927E-06 -2,12263832E-04 2,76140418E-04 A12 = 2,35742893E-05 -3,73684715E-06 4,51759081E-05 -2,56379464E-05 A14 = -3,72017261E-06 2,90527680E-07 -5,20717341E-06 1,73861833E-06 A16 = 3,60693147E-07 -8,96849064E-09 3,84981865E-07 -8,60011594E-08 A18 = -2,27730129E-08 -1,70261341E-11 -1,93046995E-08 3,08628793E-09 A20 = 9,40208299E-10 9,08263957E-12 6,67067945E-10 -7,92647091E-11 A22 = -2,32442683E-11 -2,40553289E-13 -1,57016330E-11 1,41737982E-12 A24 = 2,58861595E-13 2,12044419E-15 2,41037792E-13 -1,67408201E-14 A26 = - - -2,17935363E-15 1,17302317E-16 A28 = - - 8,81304990E-18 -3,69017136E-19

[0099] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0–21 represent the surfaces arranged along the optical axis from the object side to the image side. In Table 1B, k represents the conic coefficient of the aspherical surface profile equation. A4–A28 represent the aspherical coefficients from the 4th to the 28th order. The tables shown below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions of the tables are the same as in Table 1A and Table 1B of the first embodiment. Therefore, no further explanation is given in this regard. 2. Design

[0100] Fig. Figure 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure. Fig.Figure 4 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the second embodiment. Fig.3 The image acquisition unit 2 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0101] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of glass and both its object-side and image-side surfaces are aspherical. The image-side surface of the first lens element E1 has an inflection point.

[0102] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has one inflection point. The image-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0103] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points.

[0104] The fourth lens element E4, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has one inflection point. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0105] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0106] The sixth lens element E6, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has one inflection point.

[0107] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has four inflection points. The object-side surface of the seventh lens element E7 has one critical point in an off-axis region. The image-side surface of the seventh lens element E7 has one critical point in an off-axis region.

[0108] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the eighth lens element E8 has two inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0109] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0110] The detailed optical data of the 2nd embodiment are listed in Table 2A and the aspherical surface data are listed in Table 2B below. TABLE 2A 2. Design f = 6.89 mm, Fno = 1.75, HFOV = 45.5 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 18,7491 (ASP) 0,734 Glass 1,855 36,6 14,04 2 -32,8110 (ASP) -0,036 3 Ape. Aperture Plano 0,086 4 Lens 2 12,4643 (ASP) 0,308 plastic 1,614 26,0 -18,31 5 5,8540 (ASP) 0,309 6 Lens 3 11,7101 (ASP) 1,400 plastic 1,544 56,0 10,10 7 -9,9164 (ASP) 0,259 8 Lens 4 5,5617 (ASP) 0,434 plastic 1,614 26,0 -197,34 9 5,1597 (ASP) 0,345 10 Aperture Plano 0,480 11 Lens 5 -6,7188 (ASP) 0,330 plastic 1,661 20,3 -12,13 12 -42,3847 (ASP) 0,174 13 Lens 6 -57,5768 (ASP) 1,267 plastic 1,544 56,0 15,36 14 -7,3549 (ASP) 0,079 15 Lens 7 3,2904 (ASP) 1,033 plastic 1,544 56,0 12,21 16 5,8002 (ASP) 1,285 17 Lens 8 2,7705 (ASP) 0,612 plastic 1,544 56,0 -11,69 18 1,7796 (ASP) 0,800 19 filter Plano 0,280 Glass 1,517 64,2 - 20 Plano 0,643 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.781 mm. TABLE 2B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,13082519E-03 -5,56652596E-03 -2,82827481E-02 -2,27829085E-02 A6 = -4,95015793E-04 2,65835317E-03 5,17766799E-03 -4,96925851E-04 A8 = 3,14896878E-04 -2,97366920E-04 1,46896962E-03 3,26587066E-03 A10 = -7,88459615E-05 -1,30369519E-04 -1,58382341E-03 -2,01488302E-03 A12 = 1,03330613E-05 4,51474408E-05 4,98670517E-04 6,48928177E-04 A14 = -4,66253225E-07 -3,76140597E-06 -6,94109129E-05 -1,10018104E-04 A16 = - - 3,69505632E-06 9,74381079E-06 A18 = - - -2,61367730E-08 -3,89986773E-07 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -9,77511916E-04 -2,44167774E-02 -3,17008388E-02 -1,25882410E-02 A6 = -2,40459101E-03 6,73180163E-03 1,88647616E-03 -3,45503606E-03 A8 = 4,39899981E-04 -2,82152542E-03 -3,85863563E-04 2,16099058E-03 A10 = -3,61691046E-06 9,27863172E-04 9,94074386E-05 -9,12772784E-04 A12 = -6,13028476E-05 -2,13231194E-04 -1,32841346E-05 3,03195467E-04 A14 = 3,13979019E-05 2,97193622E-05 1,42010939E-06 -7,47733401E-05 A16 = -6,32679401E-06 -1,68585195E-06 -6,91740875E-08 1,23346292E-05 A18 = 5,88980726E-07 -8,79069970E-08 - -1,25386913E-06 A20 = -2,14077075E-08 1,28364559E-08 - 7,09072972E-08 A22 = - - - -1,71268982E-09 Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -4,65428690E-02 -7,44073375E-02 -2,70266568E-02 -1,58053865E-03 A6 = 3,54535221E-02 6,18653733E-02 3,58723103E-02 -6,76342874E-03 A8 = -1,83450501E-02 -3,44399148E-02 -2,10660226E-02 7,88558860E-03 A10 = 6,86101955E-03 1,28297149E-02 7,26937482E-03 -5,04606272E-03 A12 = -1,67936846E-03 -3,24044362E-03 -1,62218928E-03 2,10406659E-03 A14 = 2,61677792E-04 5,69284816E-04 2,38457713E-04 -6,07830932E-04 A16 = -2,51168864E-05 -6,99211771E-05 -2,26033321E-05 1,23663104E-04 A18 = 1,35776220E-06 5,90269840E-06 1,29421032E-06 -1,76272271E-05 A20 = -3,17319285E-08 -3,27667662E-07 -3,89025905E-08 1,71937094E-06 A22 = - 1,08375243E-08 4,59567067E-10 -1,09122748E-07 A24 = - -1,63149651E-10 -2,83576604E-12 4,05349118E-09 A26 = - - - -6,67480670E-11 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = -2,25982491E-03 1,12908641E-02 -5,62536442E-02 -6,48067667E-02 A6 = -2,64725646E-03 -3,11147034E-03 8,44144218E-03 1,17943932E-02 A8 = 1,05886618E-03 2,04023360E-04 -1,28690033E-03 -1,75683301E-03 A10 = -3,46253563E-04 6,20167109E-06 1,69085902E-04 1,92865991E-04 A12 = 7,41086114E-05 -1,99277777E-06 -1,52664494E-05 -1,50432156E-05 A14 = -1,04840949E-05 1,57983540E-07 9,10940800E-07 8,32621823E-07 A16 = 1,00007517E-06 -6,91819572E-09 -3,60997043E-08 -3,27771643E-08 A18 = -6,40195658E-08 1,80560743E-10 9,43737488E-10 9,10742537E-10 A20 = 2,64078467E-09 -2,63680266E-12 -1,56818575E-11 -1,74269891E-11 A22 = -6,33141065E-11 1,66092802E-14 1,50390629E-13 2,18011281E-13 A24 = 6,68005299E-13 - -6,34751547E-16 -1,60093748E-15 A26 = - - - 5,21895522E-18

[0111] In the second embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 2C below, are also the same as those given for the first embodiment, with corresponding values ​​for the second embodiment; therefore, no further explanation is given in this regard.

[0112] Furthermore, these parameters from Table 2A and Table 2B can be calculated as the following values ​​and must meet the following conditions: TABLE 2C Values ​​of the optical and physical parameters / definitions f [mm] 6,89 R16 / BL 1,03 Fno 1,75 T12 / T23 0,16 HFOV [Grade] 45,5 (CT5+T56) / CT6 0,40 FOV [degrees] 91,0 ATmax / CT7 1,24 TL / f 1,57 T67 / T78 0,06 ImgH / EPD 1,80 V2 / V3 0,46 f / f12 0,13 V5 / V3 0,36 f5 / f1 -0,86 ET6 / CT6 0,33 f6 / f1 1,09 ET78 / ET67 0,26 f5 / f6 -0,79 ET7 / ET8 1,74 R14 / R1 0,31 Y6R1 / Y7R2 0,57 R4 / R6 -0,59 SAG3R1 / SAG3R2 -0,21 |R15 / R9| 0,41 SAG7R2 / CT7 0,54 3. Design

[0113] Fig. Figure 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure. Fig.Figure 6 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the third embodiment. Fig.5 comprises the image acquisition unit 3, the optical lens system for photography (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The optical lens system for photography comprises, in the order from an object side to an image side along a ray path, a first lens element E1, a second lens element E2, an aperture diaphragm ST, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0114] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The first lens element E1 is made of glass and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has one inflection point. The image-side surface of the first lens element E1 has three inflection points. The object-side surface of the first lens element E1 has one critical point in an off-axis region. The image-side surface of the first lens element E1 has two critical points in an off-axis region.

[0115] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0116] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0117] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has an inflection point. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0118] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0119] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has five inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has four critical points in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0120] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has a critical point in an off-axis region. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0121] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has two inflection points. The image-side surface of the eighth lens element E8 has one inflection point. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0122] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0123] The detailed optical data of the 3rd embodiment are listed in Table 3A and the aspherical surface data are listed in Table 3B below. TABLE 3A 3. Design f = 7.01 mm, Fno = 1.83, HFOV = 44.7 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 -930,3206 (ASP) 2,363 Glass 1,589 61,2 -234,35 2 162,2781 (ASP) 0,201 3 Lens 2 5,8127 (ASP) 0,902 plastic 1,566 37,4 -30,21 4 4,0948 (ASP) 0,965 5 Ape. Aperture Plano -0,057 6 Lens 3 11,8898 (ASP) 1,135 plastic 1,544 56,0 13,94 7 -20,2404 (ASP) 0,325 8 Lens 4 7,7340 (ASP) 1,186 plastic 1,544 56,0 10,38 9 -19,7963 (ASP) 0,551 10 Aperture Plano 0,630 11 Lens 5 -6,8707 (ASP) 0,450 plastic 1,660 20,4 -7,48 12 17,9538 (ASP) 0,072 13 Lens 6 11,6286 (ASP) 1,530 plastic 1,544 56,0 7,30 14 -5,7529 (ASP) 0,030 15 Lens 7 4,3076 (ASP) 0,976 plastic 1,566 37,4 29,32 16 5,3412 (ASP) 1,270 17 Lens 8 3,2465 (ASP) 0,690 plastic 1,551 44,8 -10,13 18 1,8971 (ASP) 0,900 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,573 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.769 mm. TABLE 3B Aspheric coefficients Surface # 1 2 3 4 k = 0,00000E+00 0,00000E+00 -1,42524E+00 -1,76090E+00 A4 = 2,45691980E-03 -6,55957575E-03 -2,49682555E-02 -1,45507373E-02 A6 = -1,17127145E-04 4,68596741E-03 7,40815449E-03 1,12986131E-03 A8 = 1,48443558E-05 -1,42867775E-03 -2,34262630E-03 2,01616747E-03 A10 = -1,73089117E-06 2,80836650E-04 5,81365417E-04 -1,88043950E-03 A12 = 1,40066137E-07 -3,56341694E-05 -1,02252225E-04 9,56153305E-04 A14 = -6,92829553E-09 2,77942617E-06 1,21671531E-05 -2,95434404E-04 A16 = 1,88190830E-10 -1,20914846E-07 -9,19902240E-07 5,54109539E-05 A18 = -2,17875214E-12 2,24292065E-09 3,95931991E-08 -5,80029574E-06 A20 = - - -7,36012090E-10 2,62403890E-07 Surface # 6 7 8 9 k = 1,65093E+01 6,55828E+01 0,00000E+00 0,00000E+00 A4 = -2,83057337E-03 -1,09552556E-02 -1,23779803E-02 -7,22315156E-03 A6 = 9,66125198E-04 2,25878057E-03 1,08782144E-03 -4,23673674E-05 A8 = -2,37756191E-03 -1,07068802E-03 -4,07156105E-04 -2,86551626E-04 A10 = 2,58071322E-03 4,73529686E-04 1,21268222E-04 1,60208881E-04 A12 = -1,62135283E-03 -1,39886766E-04 -2,48428166E-05 -3,69699777E-05 A14 = 6,11512797E-04 2,44672127E-05 3,80110764E-06 4,91708509E-06 A16 = -1,36237238E-04 -1,70090885E-06 -3,06090104E-07 -3,66301111E-07 A18 = 1,65741051E-05 -8,09810910E-08 9,44645126E-09 1,21078923E-08 A20 = -8,47150008E-07 1,55634137E-08 - - Surface # 11 12 13 14 k = 0,00000E+00 1,77373E+01 9,35633E+00 0,00000E+00 A4 = -2,48862775E-02 -7,63941854E-02 -6,57970748E-02 -4,42404629E-03 A6 = 1,07296136E-02 5,39882412E-02 5,29412301E-02 1,25692233E-03 A8 = -4,57208240E-03 -2,70220581E-02 -2,63802285E-02 2,20377771E-04 A10 = 1,72964984E-03 9,47659647E-03 8,64054537E-03 -3,97547727E-04 A12 = -4,12838829E-04 -2,32671123E-03 -1,94704219E-03 1,96308970E-04 A14 = 6,02189047E-05 4,07149224E-04 3,06087433E-04 -5,97120772E-05 A16 = -5,30351776E-06 -5,10219952E-05 -3,33855183E-05 1,23985310E-05 A18 = 2,60984045E-07 4,49698462E-06 2,46264076E-06 -1,78354593E-06 A20 = -5,54747610E-09 -2,65308346E-07 -1,16487448E-07 1,74432156E-07 A22 = - 9,40862730E-09 3,17982208E-09 -1,10426988E-08 A24 = - -1,51556031E-10 -3,83110941E-11 4,07400879E-10 A26 = - - - -6,63781536E-12 Surface # 15 16 17 18 k = -6,92579E-01 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = -1,88989451E-03 4,03988141E-03 -5,12964343E-02 -6,28659317E-02 A6 = -8,50630517E-04 -1,66006235E-03 5,89357342E-03 1,21083252E-02 A8 = -1,78130239E-04 -9,95679644E-05 3,81525340E-05 -1,85962606E-03 A10 = 6,68109269E-05 5,59614845E-05 -1,91269903E-04 2,09629560E-04 A12 = -1,13390107E-05 -7,48232238E-06 4,00143453E-05 -1,72600069E-05 A14 = 1,51470395E-06 5,51009374E-07 -4,39290616E-06 1,05383571E-06 A16 = -1,61518809E-07 -2,49247219E-08 3,00845401E-07 -4,81698732E-08 A18 = 1,17158165E-08 6,90816953E-10 -1,35473651 E-08 1,64466790E-09 A20 = -5,14588470E-10 -1,07995906E-11 4,03451915E-10 -4,13061914E-11 A22 = 1,22643131E-11 7,29792090E-14 -7,68219032E-12 7,39427053E-13 A24 = -1,21964430E-13 2,27125227E-18 8,49758524E-14 -8,90891339E-15 A26 = - - -4,16300990E-16 6,46007673E-17 A28 = - - - -2,12536677E-19

[0124] In the third embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 3C below, are also the same as those given for the first embodiment, with corresponding values ​​for the third embodiment; therefore, no further explanation is given in this regard.

[0125] Furthermore, these parameters from Table 3A and Table 3B can be calculated as the following values ​​and must meet the following conditions: TABLE 3C Values ​​of the optical and physical parameters / definitions f [mm] 7,01 R16 / BL 1,07 Fno 1,83 T12 / T23 0,22 HFOV [Grade] 44,7 (CT5+T56) / CT6 0,34 FOV [degrees] 89,4 ATmax / CT7 1,30 TL / f 2,14 T67 / T78 0,02 ImgH / EPD 1,84 V2 / V3 0,67 f / f12 -0,26 V5 / V3 0,36 f5 / f1 0,03 ET6 / CT6 0,28 f6 / f1 -0,03 ET78 / ET67 0,19 f5 / f6 -1,02 ET7 / ET8 1,01 R14 / R1 -0,01 Y6R1 / Y7R2 0,64 R4 / R6 -0,20 SAG3R1 / SAG3R2 -0,53 |R15 / R9| 0,47 SAG7R2 / CT7 0,27 4. Design

[0126] Fig. Figure 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure. Fig.Figure 8 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 4th embodiment. Fig.7 The image acquisition unit 4 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0127] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has three inflection points. The image-side surface of the first lens element E1 has two inflection points. The object-side surface of the first lens element E1 has two critical points in an off-axis region. The image-side surface of the first lens element E1 has one critical point in an off-axis region.

[0128] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has two inflection points. The image-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0129] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0130] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0131] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0132] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has four inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has two critical points in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0133] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has one critical point in an off-axis region. The image-side surface of the seventh lens element E7 has two critical points in an off-axis region.

[0134] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has three inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0135] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0136] The detailed optical data of the 4th embodiment are listed in Table 4A and the aspherical surface data in Table 4B below. TABLE 4A 4. Design f = 6.84 mm, Fno = 1.68, HFOV = 44.7 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 -113,7409 (ASP) 0,420 plastic 1,535 55,9 -73,09 2 59,5854 (ASP) 0,110 3 Ape. Aperture Plano -0,062 4 Lens 2 5,0308 (ASP) 0,332 plastic 1,566 37,4 95,45 5 5,4150 (ASP) 0,281 6 Lens 3 7,8597 (ASP) 1,449 plastic 1,544 56,0 11,51 7 -28,7473 (ASP) 0,215 8 Lens 4 4,0812 (ASP) 0,473 plastic 1,544 56,0 24,28 9 5,6643 (ASP) 0,151 10 Aperture Plano 0,720 11 Lens 5 -4,8413 (ASP) 0,486 plastic 1,680 18,2 -8,22 12 -37,5419 (ASP) 0,135 13 Lens 6 52,9544 (ASP) 1,250 plastic 1,551 44,8 16,23 14 -10,6610 (ASP) 0,103 15 Lens 7 3,0640 (ASP) 1,283 plastic 1,551 44,8 10,10 16 5,8087 (ASP) 1,383 17 Lens 8 2,5224 (ASP) 0,656 plastic 1,566 37,4 -13,76 18 1,7264 (ASP) 0,850 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,513 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.653 mm. TABLE 4B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,22309138E-02 1,34211449E-02 -2,44493213E-02 -3,11285627E-02 A6 = -5,95831608E-03 -1,12004035E-02 2,20731655E-03 8,89947093E-03 A8 = 1,86219225E-03 4,44604172E-03 -2,84414474E-03 -5,36025558E-03 A10 = -3,99866454E-04 -1,16348326E-03 2,11807314E-03 2,83889977E-03 A12 = 4,60122282E-05 1,66376596E-04 -7,52963454E-04 -8,27724214E-04 A14 = -2,01444787E-06 -9,26795159E-06 1,48515722E-04 1,37641361E-04 A16 = - - -1,51454021E-05 -1,20468923E-05 A18 = - - 5,94912023E-07 4,00453947E-07 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -7,47516197E-03 -3,04693250E-02 -3,35270313E-02 -8,37774775E-03 A6 = 2,12548580E-03 8,41743463E-03 5,06141766E-03 -3,88145359E-03 A8 = -1,83770080E-03 -2,38998280E-03 -1,99239686E-03 8,93991491E-04 A10 = 1,18114729E-03 3,63666306E-04 6,19017442E-04 1,01245735E-04 A12 = -4,16537867E-04 4,17600888E-05 -1,19219516E-04 -1,79485187E-04 A14 = 8,82236696E-05 -3,59456140E-05 1,21293950E-05 8,05315834E-05 A16 = -1,16222719E-05 8,23198977E-06 -4,66629544E-07 -2,01885069E-05 A18 = 9,12144039E-07 -9,05061501E-07 - 2,93248345E-06 A20 = -3,28637927E-08 4,09711045E-08 - -2,28725775E-07 A22 = - - - 7,41196101E-09 Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -4,07218725E-02 -6,78912617E-02 -2,45271225E-02 5,06584540E-03 A6 = 2,29668883E-02 5,03048784E-02 3,21548590E-02 -7,84555012E-03 A8 = -9,01922956E-03 -2,63586333E-02 -1,96356054E-02 3,96916812E-03 A10 = 2,85334017E-03 9,74509033E-03 7,20567690E-03 -1,34439946E-03 A12 = -5,87726891E-04 -2,48238861E-03 -1,72420255E-03 3,34183661E-04 A14 = 7,09600473E-05 4,39768939E-04 2,72639372E-04 -7,04846060E-05 A16 = -4,41466824E-06 -5,41872056E-05 -2,77826589E-05 1,35919590E-05 A18 = 8,92096319E-08 4,54314656E-06 1,68218212E-06 -2,19798683E-06 A20 = 1,68690103E-09 -2,45173117E-07 -4,69800657E-08 2,59145488E-07 A22 = - 7,56029177E-09 -2,01878229E-10 -1,98937611E-08 A24 = - -9,85839947E-11 2,98298979E-11 8,75847258E-10 A26 = - - - -1,66802724E-11 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = -5,65204995E-04 7,60907472E-03 -5,53625235E-02 -6,61106392E-02 A6 = -6,31706689E-03 -1,98132874E-03 7,89702328E-03 1,22272832E-02 A8 = 2,96412163E-03 1,67647181E-04 -1,17917562E-03 -1,88592914E-03 A10 = -8,81132578E-04 -1,11846806E-05 1,55336633E-04 2,20104568E-04 A12 = 1,72494588E-04 8,88465799E-07 -1,41758230E-05 -1,89058954E-05 A14 = -2,29942602E-05 -6,59610344E-08 8,56470944E-07 1,18842461 E-06 A16 = 2,09516638E-06 3,31637207E-09 -3,43144609E-08 -5,42643730E-08 A18 = -1,28011766E-07 -1,00528937E-10 9,03473022E-10 1,76996463E-09 A20 = 4,99794456E-09 1,66326392E-12 -1,50369292E-11 -3,99858162E-11 A22 = -1,12225397E-10 -1,15616571E-14 1,43464237E-13 5,92017416E-13 A24 = 1,09756769E-12 - -5,97773459E-16 -5,15225452E-15 A26 = - - - 1,99396616E-17

[0137] In the fourth embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 4C below, are also the same as those given for the first embodiment, with corresponding values ​​for the fourth embodiment; therefore, no further explanation is given in this regard.

[0138] Furthermore, these parameters from Table 4A and Table 4B can be calculated as the following values ​​and must meet the following conditions: TABLE 4C Values ​​of the optical and physical parameters / definitions f [mm] 6,84 R16 / BL 1,04 Fno 1,68 T12 / T23 0,17 HFOV [Grade] 44,7 (CT5+T56) / CT6 0,50 FOV [degrees] 89,4 ATmax / CT7 1,08 TL / f 1,62 T67 / T78 0,07 ImgH / EPD 1,70 V2 / V3 0,67 f / f12 -0,02 V5 / V3 0,33 f5 / f1 0,11 ET6 / CT6 0,31 f6 / f1 -0,22 ET78 / ET67 0,21 f5 / f6 -0,51 ET7 / ET8 2,07 R14 / R1 -0,05 Y6R1 / Y7R2 0,59 R4 / R6 -0,19 SAG3R1 / SAG3R2 -0,52 |R15 / R9| 0,52 SAG7R2 / CT7 0,65 5. Design

[0139] Fig. Figure 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure. Fig.Figure 10 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 5th embodiment. Fig.9 The image acquisition unit 5 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0140] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of glass and both its object-side and image-side surfaces are aspherical. The image-side surface of the first lens element E1 has four inflection points. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0141] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has one inflection point. The image-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0142] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points. The image-side surface of the third lens element E3 has one inflection point.

[0143] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0144] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0145] The sixth lens element E6, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has four inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has two critical points in an off-axis region.

[0146] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has a critical point in an off-axis region. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0147] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has three inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0148] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0149] The detailed optical data of the 5th embodiment are listed in Table 5A and the aspherical surface data in Table 5B below. TABLE 5A 5. Design f = 6.90 mm, Fno = 1.83, HFOV = 45.1 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 16,0125 (ASP) 0,770 Glass 1,806 40,7 21,88 2 169,7965 (ASP) 0,021 3 Ape. Aperture Plano 0,029 4 Lens 2 7,8494 (ASP) 0,400 plastic 1,587 28,3 -17,88 5 4,4064 (ASP) 0,241 6 Lens 3 7,9037 (ASP) 1,345 plastic 1,544 56,0 10,26 7 -17,8909 (ASP) 0,326 8 Lens 4 4,2726 (ASP) 0,612 plastic 1,544 56,0 31,17 9 5,4233 (ASP) 0,009 10 Aperture Plano 0,711 11 Lens 5 -5,5608 (ASP) 0,400 plastic 1,669 19,5 -10,62 12 -26,2827 (ASP) 0,120 13 Lens 6 -51,4037 (ASP) 1,286 plastic 1,544 56,0 23,67 14 -10,3877 (ASP) 0,050 15 Lens 7 3,0745 (ASP) 1,180 plastic 1,544 56,0 9,15 16 6,9567 (ASP) 1,104 17 Lens 8 2,6403 (ASP) 0,674 plastic 1,534 56,0 -11,83 18 1,6968 (ASP) 0,900 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,604 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.785 mm. TABLE 5B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,46705262E-03 -7,53260111E-03 -3,74889513E-02 -3,21486586E-02 A6 = -6,43334650E-04 1,13004903E-02 1,39809954E-02 1,23094466E-02 A8 = 3,11996203E-04 -9,97945067E-03 1,08995931E-02 -1,28610197E-02 A10 = -1,15245167E-04 5,65015427E-03 -4,38650069E-02 1,41393069E-02 A12 = 3,29738363E-05 -2,06042197E-03 6,18471191E-02 -1,27514832E-02 A14 = -6,69737552E-06 4,62912099E-04 -5,31887711E-02 8,50896927E-03 A16 = 8,07818743E-07 -5,81058706E-05 3,06353092E-02 -4,02160810E-03 A18 = -4,11597300E-08 3,12355362E-06 -1,20718489E-02 1,31938119E-03 A20 = - - 3,21654073E-03 -2,92319161E-04 A22 = - - -5,54294919E-04 4,15664605E-05 A24 = - - 5,57496179E-05 -3,41514811E-06 A26 = - - -2,48430489E-06 1,22966973E-07 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -3,21976069E-03 -2,92625236E-02 -3,52268428E-02 -1,42985475E-02 A6 = -3,06511672E-03 1,18065649E-02 7,16791118E-03 5,66506413E-03 A8 = 6,07041984E-03 -9,47162022E-03 -4,82374999E-03 -1,05843981E-02 A10 = -8,20378931E-03 8,16525932E-03 2,08910331E-03 9,83584186E-03 A12 = 6,40843115E-03 -5,93776532E-03 -3,33772211E-05 -6,02488053E-03 A14 = -3,20354994E-03 3,26837087E-03 -6,04312986E-04 2,62136862E-03 A16 = 1,05649395E-03 -1,32018007E-03 4,20849473E-04 -8,24879786E-04 A18 = -2,27529025E-04 3,82636584E-04 -1,61532468E-04 1,86596000E-04 A20 = 3,07095036E-05 -7,65966767E-05 4,10185161E-05 -2,98078970E-05 A22 = -2,35372621E-06 9,76995439E-06 -7,18439914E-06 3,26346341 E-06 A24 = 7,80572068E-08 -6,21584656E-07 8,59313689E-07 -2,32251129E-07 A26 = - -9,73152845E-09 -6,68455171E-08 9,66067608E-09 A28 = - 4,18376451E-09 3,03697439E-09 -1,78033421E-10 A30 = - -1,92464266E-10 -6,09582723E-11 - Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -5,89918377E-02 -1,04026149E-01 -5,12053479E-02 1,77285053E-02 A6 = 7,35191223E-02 1,43826825E-01 1,08127797E-01 -3,83226565E-02 A8 = -7,28329752E-02 -1,30706089E-01 -1,06051224E-01 3,59692766E-02 A10 = 5,51220785E-02 8,14225120E-02 6,66713126E-02 -2,43768449E-02 A12 = -3,12279644E-02 -3,63979942E-02 -2,97256688E-02 1,21829680E-02 A14 = 1,34519852E-02 1,20900335E-02 9,80629894E-03 -4,50224187E-03 A16 = -4,38850429E-03 -3,02786984E-03 -2,43637070E-03 1,23357415E-03 A18 = 1,06942434E-03 5,71994073E-04 4,57477016E-04 -2,50508926E-04 A20 = -1,91625372E-04 -8,07260799E-05 -6,44505395E-05 3,74700171E-05 A22 = 2,47572089E-05 8,34746347E-06 6,68855722E-06 -4,06533844E-06 A24 = -2,23688318E-06 -6,11773387E-07 -4,94528716E-07 3,10632701E-07 A26 = 1,33907934E-07 2,99983325E-08 2,45628460E-08 -1,58270141E-08 A28 = -4,76781078E-09 -8,80377645E-10 -7,31787187E-10 4,82095556E-10 A30 = 7,64027331E-11 1,16642285E-11 9,84159629E-12 -6,63352978E-12 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = 8,39111090E-03 7,35542904E-03 -6,48040489E-02 -7,78463426E-02 A6 = -1,99612038E-02 2,96079432E-03 9,21465969E-03 1,67978404E-02 A8 = 1,34644453E-02 -3,10685020E-03 -6,72037015E-04 -3,03779131E-03 A10 = -6,33512683E-03 1,00654770E-03 -7,44029300E-05 4,28764018E-04 A12 = 2,09269964E-03 -1,99742872E-04 2,92039693E-05 -4,63801297E-05 A14 = -4,97243178E-04 2,76122232E-05 -4,15940000E-06 3,84639663E-06 A16 = 8,65056133E-05 -2,77074880E-06 3,61019778E-07 -2,44161413E-07 A18 = -1,10972849E-05 2,04510454E-07 -2,12836946E-08 1,17711657E-08 A20 = 1,04641512E-06 -1,10957572E-08 8,84830297E-10 -4,25054656E-10 A22 = -7,14962964E-08 4,36999902E-10 -2,61074528E-11 1,12524055E-11 A24 = 3,43665253E-09 -1,21506732E-11 5,37160898E-13 -2,11130279E-13 A26 = -1,09981642E-10 2,26076449E-13 -7,34664761E-15 2,65118275E-15 A28 = 2,09976274E-12 -2,52551858E-15 6,01198712E-17 -1,99436798E-17 A30 = -1,80633905E-14 1,28058914E-17 -2,22948730E-19 6,78588798E-20

[0150] In the 5th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 5C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 5th embodiment; therefore, no further explanation is given in this regard.

[0151] Furthermore, these parameters from Table 5A and Table 5B can be calculated as the following values ​​and must meet the following conditions: TABLE 5C Values ​​of the optical and physical parameters / definitions f [mm] 6,90 R16 / BL 0,94 Fno 1,83 T12 / T23 0,21 HFOV [Grade] 45,1 (CT5+T56) / CT6 0,40 FOV [degrees] 90,2 ATmax / CT7 0,94 TL / f 1,61 T67 / T78 0,05 ImgH / EPD 1,87 V2 / V3 0,51 f / f12 -0,05 V5 / V3 0,35 f5 / f1 -0,49 ET6 / CT6 0,30 f6 / f1 1,08 ET78 / ET67 0,35 f5 / f6 -0,45 ET7 / ET8 1,30 R14 / R1 0,43 Y6R1 / Y7R2 0,61 R4 / R6 -0,25 SAG3R1 / SAG3R2 -0,33 |R15 / R9| 0,47 SAG7R2 / CT7 0,15 6. Design

[0152] Fig. Figure 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure. Fig.Figure 12 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 6th embodiment. Fig.11 The image acquisition unit 6 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0153] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the first lens element E1 has two inflection points. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0154] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has one inflection point. The image-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0155] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points.

[0156] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has an inflection point. The image-side surface of the fourth lens element E4 has an inflection point. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0157] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fifth lens element E5 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has a critical point in an off-axis region. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0158] The sixth lens element E6, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The sixth lens element E6 is made of glass and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has one inflection point.

[0159] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has a critical point in an off-axis region. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0160] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has three inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0161] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0162] The detailed optical data of the 6th embodiment are listed in Table 6A and the aspherical surface data are listed in Table 6B below. TABLE 6A 6. Design f = 8.05 mm, Fno = 1.90, HFOV = 40.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 8,9275 (ASP) 1,519 plastic 1,545 56,1 16,58 2 694,0092 (ASP) 0,490 3 Ape. Aperture Plano 0,018 4 Lens 2 8,5264 (ASP) 0,282 plastic 1,587 28,3 -16,99 5 4,5414 (ASP) 0,326 6 Lens 3 9,5957 (ASP) 1,098 plastic 1,544 56,0 12,70 7 -23,6807 (ASP) 0,351 8 Lens 4 5,3901 (ASP) 0,449 plastic 1,584 28,2 865,63 9 5,2808 (ASP) 0,442 10 Aperture Plano 0,310 11 Lens 5 -9,5682 (ASP) 0,270 plastic 1,669 19,5 -20,84 12 -30,8410 (ASP) 0,197 13 Lens 6 -71,8106 (ASP) 1,240 Glass 1,564 60,8 12,74 14 -6,5725 (ASP) 0,209 15 Lens 7 3,7702 (ASP) 1,018 plastic 1,529 45,4 19,04 16 5,4621 (ASP) 1,732 17 Lens 8 3,1144 (ASP) 0,541 plastic 1,530 55,8 -9,90 18 1,8370 (ASP) 1,000 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,508 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.815 mm. TABLE 6B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -4,05665425E-04 -1,33542546E-03 -2,33474186E-02 -2,26016233E-02 A6 = -2,95731518E-05 9,19574575E-05 3,51550802E-03 1,72341642E-03 A8 = 3,40696113E-06 -2,48547705E-05 -1,16391576E-03 6,82792983E-04 A10 = -6,45012620E-07 5,93887814E-06 5,38349946E-04 -9,07904700E-04 A12 = 6,25775022E-08 -5,47833886E-07 -1,30377833E-04 5,40294335E-04 A14 = -1,83829212E-09 1,79224787E-08 1,21446903E-05 -1,63080465E-04 A16 = - - 6,23255009E-07 2,52982485E-05 A18 = - - -1,49166290E-07 -1,59059894E-06 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,49241576E-03 -2,10571851E-02 -3,08027468E-02 -1,45355193E-02 A6 = -1,08092142E-03 4,32985832E-03 1,70097313E-03 -1,68628588E-03 A8 = 3,74971437E-04 -9,45231944E-04 -1,34693592E-04 1,63119786E-03 A10 = -5,36474306E-04 -3,53919461E-04 -1,74876263E-04 -8,22389847E-04 A12 = 2,86267304E-04 3,63074376E-04 7,60010354E-05 2,86796436E-04 A14 = -7,40760028E-05 -1,37429793E-04 -1,08566610E-05 -6,79146483E-05 A16 = 9,56088615E-06 2,84945384E-05 5,54276675E-07 1,02888537E-05 A18 = -4,13877933E-07 -3,17915275E-06 - -9,32413540E-07 A20 = -9,96028355E-09 1,50502354E-07 - 4,50244385E-08 A22 = - - - -8,55818182E-10 Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -4,16764420E-02 -6,33097303E-02 -2,22352398E-02 -8,95129317E-04 A6 = 2,50642993E-02 4,38825263E-02 2,46664671E-02 -1,51211917E-03 A8 = -1,05866900E-02 -2,23798132E-02 -1,38731830E-02 1,35723159E-03 A10 = 3,67756401E-03 8,42352117E-03 4,84629551E-03 -9,35301513E-04 A12 = -8,75357131E-04 -2,28270238E-03 -1,13387381E-03 4,46249396E-04 A14 = 1,32249872E-04 4,50850126E-04 1,79812557E-04 -1,46661850E-04 A16 = -1,21005603E-05 -6,49721522E-05 -1,90260885E-05 3,32787468E-05 A18 = 6,11269028E-07 6,68465538E-06 1,28493187E-06 -5,19419204E-06 A20 = -1,30975508E-08 -4,65000220E-07 -5,08956889E-08 5,47006971E-07 A22 = - 1,95122850E-08 1,01884039E-09 -3,71069754E-08 A24 = - -3,70794717E-10 -8,02940683E-12 1,46315430E-09 A26 = - - - -2,54516646E-11 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = 2,25763009E-03 9,49133526E-03 -6,11687104E-02 -7,08700849E-02 A6 = -3,92811728E-03 -2,67696488E-03 1,06292679E-02 1,46422948E-02 A8 = 1,14943974E-03 1,36124915E-04 -1,47050757E-03 -2,38132422E-03 A10 = -2,89342093E-04 2,07894086E-05 1,47872085E-04 2,82868384E-04 A12 = 5,42840981E-05 -4,34230855E-06 -9,92463993E-06 -2,42785358E-05 A14 = -7,21294380E-06 3,76154473E-07 4,35379685E-07 1,50563678E-06 A16 = 6,69227630E-07 -1,87293330E-08 -1,22349477E-08 -6,72133849E-08 A18 = -4,26595296E-08 5,52876409E-10 2,07196902E-10 2,13372652E-09 A20 = 1,78507256E-09 -8,99810662E-12 -1,75008773E-12 -4,69124996E-11 A22 = -4,39870612E-11 6,22480761E-14 1,48162021E-15 6,78176096E-13 A24 = 4,80513696E-13 - 5,66068822E-17 -5,79269302E-15 A26 = - - - 2,21339391E-17

[0163] In the 6th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 6C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 6th embodiment; therefore, no further explanation is given in this regard.

[0164] Furthermore, these parameters from Table 6A and Table 6B can be calculated as the following values ​​and must meet the following conditions: TABLE 6C Values ​​of the optical and physical parameters / definitions f [mm] 8,05 R16 / BL 1,02 Fno 1,90 T12 / T23 1,56 HFOV [Grade] 40,2 (CT5+T56) / CT6 0,38 FOV [degrees] 80,4 ATmax / CT7 1,70 TL / f 1,53 T67 / T78 0,12 ImgH / EPD 1,64 V2 / V3 0,51 f / f12 0,07 V5 / V3 0,35 f5 / f1 -1,26 ET6 / CT6 0,35 f6 / f1 0,77 ET78 / ET67 0,36 f5 / f6 -1,64 ET7 / ET8 1,88 R14 / R1 0,61 Y6R1 / Y7R2 0,60 R4 / R6 -0,19 SAG3R1 / SAG3R2 -0,33 |R15 / R9| 0,33 SAG7R2 / CT7 0,75 7. Design

[0165] Fig. Figure 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure. Fig.Figure 14 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 7th embodiment. Fig.13 The image acquisition unit 7 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in the order from an object side to an image side along a ray path, a first lens element E1, an aperture S1, a second lens element E2, an aperture diaphragm ST, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0166] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has two inflection points. The image-side surface of the first lens element E1 has two inflection points. The object-side surface of the first lens element E1 has a critical point in an off-axis region. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0167] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has two inflection points.

[0168] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0169] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth lens element E4 has an inflection point.

[0170] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspheric. The object-side surface of the fifth lens element E5 has one inflection point. The image-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three critical points in an off-axis region.

[0171] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The image-side surface of the sixth lens element E6 has a critical point in an off-axis region.

[0172] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has a critical point in an off-axis region. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0173] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and has both an object-side and an image-side surface that are aspherical. The object-side surface of the eighth lens element E8 has four inflection points. The image-side surface of the eighth lens element E8 has two inflection points. The object-side surface of the eighth lens element E8 has one critical point in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0174] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0175] The detailed optical data of the 7th embodiment are listed in Table 7A and the aspherical surface data are listed in Table 7B below. TABLE 7A 7. Design f = 6.52 mm, Fno = 1.88, HFOV = 47.4 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 -6,0077 (ASP) 1,006 plastic 1,545 56,1 -31,79 2 -9,7412 (ASP) 1,310 3 Aperture Plano -0,215 4 Lens 2 5,4225 (ASP) 0,757 plastic 1,566 37,4 309,20 5 5,3135 (ASP) 1,544 6 Ape. Aperture Plano 0,005 7 Lens 3 40,4289 (ASP) 1,005 plastic 1,544 56,0 12,50 8 -8,1066 (ASP) 0,030 9 Lens 4 16,6182 (ASP) 1,309 plastic 1,544 56,0 11,38 10 -9,5974 (ASP) 0,416 11 Aperture Plano 0,760 12 Lens 5 -7,6140 (ASP) 0,613 plastic 1,615 25,3 -6,89 13 9,8518 (ASP) 0,041 14 Lens 6 17,5136 (ASP) 1,413 plastic 1,544 56,0 15,32 15 -15,4486 (ASP) 0,030 16 Lens 7 3,7868 (ASP) 1,787 plastic 1,551 44,8 11,30 17 8,0538 (ASP) 1,249 18 Lens 8 3,4446 (ASP) 0,659 plastic 1,562 44,6 -13,50 19 2,2060 (ASP) 1,000 20 filter Plano 0,300 Glass 1,517 64,2 - 21 Plano 0,368 22 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 3) is 3.454 mm. An effective radius of aperture S2 (surface 11) is 2.513 mm. TABLE 7B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 2,44648E+00 -6,79367E-01 -1,55363E+00 A4 = 2,00219985E-02 2,34329616E-02 2,98489213E-03 1,10755716E-03 A6 = -3,05112344E-03 -3,92555053E-03 -4,34016313E-03 -3,97158929E-03 A8 = 4,99197521E-04 7,15871923E-04 1,15013512E-03 2,12536986E-03 A10 = -6,91102836E-05 -1,18061574E-04 -2,68908545E-04 -9,82152327E-04 A12 = 7,52396825E-06 1,61837432E-05 4,61077340E-05 3,47723961E-04 A14 = -6,11959086E-07 -1,68774900E-06 -4,78256766E-06 -8,25398502E-05 A16 = 3,58566119E-08 1,23087749E-07 2,75698115E-07 1,24507054E-05 A18 = -1,45512274E-09 -5,77191595E-09 -7,67734607E-09 -1,06923604E-06 A20 = 3,85547581E-11 1,54063955E-10 6,66491164E-11 3,97538011E-08 A22 = -5,96152791E-13 -1,76455960E-12 - - A24 = 4,04659019E-15 - - - Surface # 7 8 9 10 k = 9,90000E+01 -5,62424E-01 0,00000E+00 0,00000E+00 A4 = 3,87215182E-04 2,25549552E-03 4,23222477E-04 -8,49732445E-03 A6 = -3,43427710E-04 -8,25000328E-04 -7,14872458E-04 -4,23707567E-04 A8 = 3,04418755E-04 5,39472049E-04 4,23198094E-04 7,44317235E-04 A10 = -9,41780058E-05 -1,19572456E-04 -8,26634962E-05 -3,80088408E-04 A12 = 1,99617857E-05 1,45326511E-05 5,08095941E-06 1,21544589E-04 A14 = -1,67670757E-06 6,94282231E-08 1,49764071E-06 -2,26425837E-05 A16 = - -1,43456878E-07 -2,79956600E-07 2,30088564E-06 A18 = - - 1,25726014E-08 -9,73198041E-08 Surface # 12 13 14 15 k = 0,00000E+00 4,14210E+00 1,70422E+01 0,00000E+00 A4 = -2,97585852E-02 -5,64109652E-02 -3,21465775E-02 -1,89075472E-02 A6 = 1,02757377E-02 4,23554805E-02 3,60332498E-02 5,99407769E-03 A8 = -4,42471423E-03 -2,31706496E-02 -2,17533766E-02 -2,88098161E-03 A10 = 1,70845664E-03 8,43037140E-03 8,17420397E-03 1,61670102E-03 A12 = -4,18958104E-04 -2,04765531E-03 -2,05460233E-03 -6,69659557E-04 A14 = 6,13726471E-05 3,36887386E-04 3,56096278E-04 1,86813664E-04 A16 = -5,02697738E-06 -3,74682309E-05 -4,28294811E-05 -3,53054887E-05 A18 = 1,88313973E-07 2,74317447E-06 3,51574520E-06 4,53974094E-06 A20 = -1,24013378E-09 -1,23943489E-07 -1,87864025E-07 -3,91576547E-07 A22 = - 2,99542689E-09 5,88548930E-09 2,16827419E-08 A24 = - -2,63175498E-11 -8,19868131E-11 -6,95852895E-10 A26 = - - - 9,82261082E-12 Surface # 16 17 18 19 k = -8,08767E-01 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = -1,79954191E-02 9,21336445E-03 -4,49498999E-02 -4,72101972E-02 A6 = 2,69622235E-03 -4,04985919E-03 1,18119963E-02 9,31400609E-03 A8 = -4,84279488E-04 9,01216282E-04 -4,28530793E-03 -1,89604129E-03 A10 = 7,46929248E-05 -1,51535183E-04 1,19394127E-03 3,16723269E-04 A12 = -1,55755834E-05 1,84292302E-05 -2,23921666E-04 -3,87981063E-05 A14 = 3,43362069E-06 -1,52814400E-06 2,84455554E-05 3,37538298E-06 A16 = -5,15828174E-07 8,38974458E-08 -2,48486806E-06 -2,07622684E-07 A18 = 4,69423973E-08 -2,97189563E-09 1,50555154E-07 9,02322989E-09 A20 = -2,49392956E-09 6,47450595E-11 -6,30905080E-09 -2,74913822E-10 A22 = 7,13854138E-11 -7,81700657E-13 1,79312179E-10 5,74081816E-12 A24 = -8,52025045E-13 3,95903397E-15 -3,29819837E-12 -7,82448376E-14 A26 = - - 3,54173922E-14 6,26955624E-16 A28 = - - -1,68610442E-16 -2,23999039E-18

[0176] In the 7th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 7C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 7th embodiment; therefore, no further explanation is given in this regard.

[0177] Furthermore, these parameters from Table 7A and Table 7B can be calculated as the following values ​​and must meet the following conditions: TABLE 7C Values ​​of the optical and physical parameters / definitions f [mm] 6,52 R16 / BL 1,32 Fno 1,88 T12 / T23 0,71 HFOV [Grade] 47,4 (CT5+T56) / CT6 0,46 FOV [degrees] 94,8 ATmax / CT7 0,87 TL / f 2,36 T67 / T78 0,02 ImgH / EPD 2,05 V2 / V3 0,67 f / f12 -0,19 V5 / V3 0,45 f5 / f1 0,22 ET6 / CT6 0,30 f6 / f1 -0,48 ET78 / ET67 0,18 f5 / f6 -0,45 ET7 / ET8 1,41 R14 / R1 -1,34 Y6R1 / Y7R2 0,62 R4 / R6 -0,66 SAG3R1 / SAG3R2 -0,38 |R15 / R9| 0,45 SAG7R2 / CT7 0,09 8. Design

[0178] Fig. Figure 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure. Fig.Figure 16 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 8th embodiment. Fig.In reference 15, the image acquisition unit 8 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0179] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point.

[0180] The second lens element E2, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has one inflection point. The image-side surface of the second lens element E2 has two inflection points.

[0181] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of glass and both its object-side and image-side surfaces are aspherical.

[0182] The fourth lens element E4, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0183] The fifth lens element E5, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0184] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has two critical points in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0185] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has one critical point in an off-axis region. The image-side surface of the seventh lens element E7 has two critical points in an off-axis region.

[0186] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the eighth lens element E8 has two inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0187] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0188] The detailed optical data of the 8th embodiment are listed in Table 8A and the aspherical surface data are listed in Table 8B below. TABLE 8A 8. Design f = 7.38 mm, Fno = 1.80, HFOV = 43.1 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 10,2931 (ASP) 0,780 plastic 1,544 56,0 10,83 2 -13,4179 (ASP) -0,155 3 Ape. Aperture Plano 0,205 4 Lens 2 -107,1811 (ASP) 0,304 plastic 1,566 37,4 -18,18 5 11,3979 (ASP) 0,353 6 Lens 3 -78,7402 (ASP) 0,986 Glass 1,552 63,4 34,14 7 -15,2839 (ASP) 0,225 8 Lens 4 3,8520 (ASP) 0,421 plastic 1,551 44,8 23,45 9 5,2765 (ASP) 0,307 10 Aperture Plano 0,740 11 Lens 5 -5,5638 (ASP) 0,384 plastic 1,639 23,5 -9,33 12 -85,6919 (ASP) 0,050 13 Lens 6 72,7024 (ASP) 1,305 plastic 1,544 56,0 26,87 14 -18,1784 (ASP) 0,111 15 Lens 7 2,6866 (ASP) 1,223 plastic 1,534 56,0 8,27 16 5,7720 (ASP) 1,825 17 Lens 8 2,8400 (ASP) 0,605 plastic 1,544 56,0 -12,09 18 1,8348 (ASP) 1,000 19 filter Plano 0,300 Glass 1,517 64,2 - 20 Plano 0,337 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.736 mm. TABLE 8B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,70489155E-03 -2,48848842E-03 -1,29109583E-02 -6,70658833E-03 A6 = 7,98487692E-04 -1,11720750E-03 -5,83292599E-03 -8,53471054E-03 A8 = -5,37251858E-04 1,58028129E-03 5,68723578E-03 5,68520771E-03 A10 = 1,95541210E-04 -5,79787307E-04 -1,97494601E-03 -2,03595761E-03 A12 = -3,71514154E-05 8,78716848E-05 3,63788178E-04 5,41201194E-04 A14 = 2,56987945E-06 -4,73744420E-06 -3,61556716E-05 -1,01574116E-04 A16 = - - 2,29597870E-06 1,21375871E-05 A18 = - - -1,25128370E-07 -6,65753750E-07 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 4,24162524E-03 -2,63071865E-02 -3,30824125E-02 -1,02890083E-02 A6 = -4,45150354E-03 7,66239251E-03 5,46964627E-03 -1,93583103E-03 A8 = -7,89494903E-04 -4,30831401E-03 -3,19201035E-03 -3,97374679E-04 A10 = 1,16674376E-03 1,83236285E-03 1,15147700E-03 4,06023017E-04 A12 = -5,18094786E-04 -5,38205401E-04 -2,12064621E-04 -1,16349156E-04 A14 = 1,36604801E-04 1,06795977E-04 1,91998974E-05 2,10394236E-05 A16 = -2,18707199E-05 -1,39081335E-05 -6,66912296E-07 -3,38875939E-06 A18 = 1,88623895E-06 1,07052127E-06 - 4,62197401E-07 A20 = -6,07698258E-08 -3,70585370E-08 - -3,87154005E-08 A22 = - - - 1,37569097E-09 Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -4,91457563E-02 -6,53454694E-02 -3,45458465E-03 -7,79381661E-03 A6 = 2,96017143E-02 4,20356237E-02 1,04948655E-02 -6,97908312E-04 A8 = -1,08808609E-02 -1,82475212E-02 -6,67154148E-03 1,27787694E-03 A10 = 3,13008522E-03 5,81510580E-03 2,42785408E-03 -6,26074964E-04 A12 = -6,75352872E-04 -1,32632577E-03 -5,81946778E-04 2,04789203E-04 A14 = 1,00305554E-04 2,11813352E-04 9,52769209E-05 -4,97623622E-05 A16 = -9,42506117E-06 -2,32011063E-05 -1,07312579E-05 9,01213439E-06 A18 = 4,99866075E-07 1,69249202E-06 8,19358641E-07 -1,18593810E-06 A20 = -1,14162222E-08 -7,77635414E-08 -4,07089750E-08 1,08959102E-07 A22 = - 1,99655467E-09 1,20177438E-09 -6,57742565E-09 A24 = - -2,09419290E-11 -1,63207014E-11 2,33360449E-10 A26 = - - - -3,67413329E-12 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = -1,85406450E-02 9,46945718E-03 -5,29401691E-02 -6,08557996E-02 A6 = 3,63462537E-03 -2,66595127E-03 9,29011591E-03 1,14483206E-02 A8 = -8,36291652E-04 3,63182593E-04 -1,50719782E-03 -1,68977566E-03 A10 = 1,46325328E-04 -4,09132926E-05 1,80366591E-04 1,79932033E-04 A12 = -2,04421879E-05 3,54601213E-06 -1,42564502E-05 -1,37841974E-05 A14 = 2,15589746E-06 -2,14960919E-07 7,43707166E-07 7,65143993E-07 A16 = -1,62412980E-07 8,62250041E-09 -2,58550458E-08 -3,07160159E-08 A18 = 8,14479349E-09 -2,16875394E-10 5,94229986E-10 8,79668047E-10 A20 = -2,44891140E-10 3,09310021E-12 -8,68377725E-12 -1,74656417E-11 A22 = 3,68292874E-12 -1,90910228E-14 7,31537926E-14 2,27878392E-13 A24 = -1,70202501E-14 - -2,70597071E-16 -1,75427196E-15 A26 = - - - 6,03136047E-18

[0189] In the 8th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 8C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 8th embodiment; therefore, no further explanation is given in this regard.

[0190] Furthermore, these parameters from Table 8A and Table 8B can be calculated as the following values ​​and must meet the following conditions: TABLE 8C Values ​​of the optical and physical parameters / definitions f [mm] 7,38 R16 / BL 1,12 Fno 1,80 T12 / T23 0,14 HFOV [Grade] 43,1 (CT5+T56) / CT6 0,33 FOV [degrees] 86,2 ATmax / CT7 1,49 TL / f 1,53 T67 / T78 0,06 ImgH / EPD 1,71 V2 / V3 0,59 f / f12 0,29 V5 / V3 0,37 f5 / f1 -0,86 ET6 / CT6 0,35 f6 / f1 2,48 ET78 / ET67 0,44 f5 / f6 -0,35 ET7 / ET8 1,85 R14 / R1 0,56 Y6R1 / Y7R2 0,62 R4 / R6 -0,75 SAG3R1 / SAG3R2 0,24 |R15 / R9| 0,51 SAG7R2 / CT7 0,84 9. Design

[0191] Fig. Figure 17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure. Fig.Figure 18 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to embodiment 9. Fig.17 The image acquisition unit 9 comprises the optical lens system for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens system for photography comprises, in order from an object side to an image side along a ray path, a first lens element E1, an aperture diaphragm ST, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S1, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image surface IMG. The optical lens system for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any eight adjacent lens elements.

[0192] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0193] The second lens element E2, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has one inflection point. The image-side surface of the second lens element E2 has two inflection points. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0194] The third lens element E3, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points.

[0195] The fourth lens element E4, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has an inflection point. The image-side surface of the fourth lens element E4 has an inflection point. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0196] The fifth lens element E5, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0197] The sixth lens element E6, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The sixth lens element E6 is made of glass and both its object-side and image-side surfaces are aspheric. The object-side surface of the sixth lens element E6 has four inflection points. The image-side surface of the sixth lens element E6 has one inflection point. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0198] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The seventh lens element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has two inflection points. The object-side surface of the seventh lens element E7 has one critical point in an off-axis region. The image-side surface of the seventh lens element E7 has two critical points in an off-axis region.

[0199] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The eighth lens element E8 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the eighth lens element E8 has two inflection points. The image-side surface of the eighth lens element E8 has three inflection points. The object-side surface of the eighth lens element E8 has two critical points in an off-axis region. The image-side surface of the eighth lens element E8 has one critical point in an off-axis region.

[0200] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the optical lens system used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens system used for photography.

[0201] The detailed optical data of the 9th embodiment are listed in Table 9A and the aspherical surface data in Table 9B below. TABLE 9A 9. Design f = 8.01 mm, Fno = 1.87, HFOV = 40.4 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 6,7296 (ASP) 1,295 plastic 1,545 56,1 13,37 2 82,3835 (ASP) 0,242 3 Ape. Aperture Plano 0,066 4 Lens 2 8,6149 (ASP) 0,290 plastic 1,587 28,3 -14,73 5 4,2629 (ASP) 0,356 6 Lens 3 8,2670 (ASP) 1,288 plastic 1,544 56,0 8,75 7 -10,5940 (ASP) 0,130 8 Lens 4 8,1447 (ASP) 0,400 plastic 1,566 37,4 -19,17 9 4,5704 (ASP) 0,650 10 Aperture Plano -0,150 11 Lens 5 65,2606 (ASP) 0,300 plastic 1,587 28,3 -34,10 12 15,2964 (ASP) 0,347 13 Lens 6 124,5671 (ASP) 1,265 Glass 1,552 63,4 10,30 14 -5,9400 (ASP) 0,500 15 Lens 7 4,6472 (ASP) 0,933 plastic 1,544 56,0 41,14 16 5,4502 (ASP) 1,484 17 Lens 8 3,2547 (ASP) 0,500 plastic 1,530 55,8 -9,35 18 1,8604 (ASP) 0,900 19 filter Plano 0,280 Glass 1,517 64,2 - 20 Plano 0,524 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 10) is 2.906 mm. TABLE 9B Aspheric coefficients Surface # 1 2 4 5 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -6,79070558E-04 -2,52115053E-03 -2,50848859E-02 -2,64638538E-02 A6 = -1,02181339E-04 4,08307438E-04 6,31198940E-03 5,75024023E-03 A8 = 1,59062214E-05 -1,82966596E-04 -2,00280505E-03 -1,32206056E-03 A10 = -3,39868774E-06 3,80604593E-05 4,48078869E-04 -3,23584808E-05 A12 = 2,64758262E-07 -3,50987499E-06 -2,47627209E-05 1,72427900E-04 A14 = -4,75057436E-09 1,25846701E-07 -1,40952521E-05 -5,90680067E-05 A16 = - - 3,66942839E-06 9,42929588E-06 A18 = - - -2,95964836E-07 -6,10675066E-07 Surface # 6 7 8 9 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -3,15128047E-03 -2,43792349E-02 -3,82335879E-02 -1,79852257E-02 A6 = -6,16864625E-04 7,70123265E-03 5,60098906E-03 -3,36622289E-04 A8 = 2,82291227E-04 -2,29230986E-03 -8,25405052E-04 1,93500047E-03 A10 = -3,18256597E-04 1,37389476E-04 -1,83360413E-04 -1,15374851E-03 A12 = 1,63619217E-04 1,74178866E-04 1,05665373E-04 4,04671249E-04 A14 = -4,84017212E-05 -7,68787493E-05 -1,54515882E-05 -9,36242753E-05 A16 = 8,65384570E-06 1,57414577E-05 7,66498536E-07 1,41981145E-05 A18 = -8,06304270E-07 -1,67191815E-06 - -1,33981100E-06 A20 = 2,92309070E-08 7,47416380E-08 - 7,07527016E-08 A22 = - - - -1,58953157E-09 Surface # 11 12 13 14 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -3,59777978E-02 -4,25731575E-02 -5,07788889E-03 6,75635649E-04 A6 = 1,75703694E-02 2,00515167E-02 4,23770491E-03 -2,66194077E-03 A8 = -5,87295460E-03 -8,01235979E-03 -2,00359092E-03 2,30780283E-03 A10 = 1,79911278E-03 2,99320068E-03 8,21748198E-04 -1,47046347E-03 A12 = -4,01841349E-04 -9,47354983E-04 -3,10118289E-04 6,98062875E-04 A14 = 5,83329521E-05 2,35327934E-04 8,92797444E-05 -2,34218564E-04 A16 = -5,24207409E-06 -4,18079086E-05 -1,78882866E-05 5,42623668E-05 A18 = 2,67693359E-07 4,95027213E-06 2,39413951E-06 -8,59918597E-06 A20 = -6,01339292E-09 -3,66742211E-07 -2,03640154E-07 9,14601270E-07 A22 = - 1,53200693E-08 9,93050596E-09 -6,23903284E-08 A24 = - -2,75147709E-10 -2,10668980E-10 2,46501620E-09 A26 = - - - -4,28428813E-11 Surface # 15 16 17 18 k = -1,00000E+00 0,00000E+00 -1,00000E+00 -1,00000E+00 A4 = 5,27841649E-03 1,06827112E-02 -6,18716671E-02 -7,21179661E-02 A6 = -4,53283500E-03 -3,89116981E-03 1,15312175E-02 1,55713996E-02 A8 = 1,16671621 E-03 5,27600061E-04 -1,67021864E-03 -2,65243348E-03 A10 = -2,49381396E-04 -4,74680461E-05 1,71155474E-04 3,31948111E-04 A12 = 4,14024389E-05 2,90961049E-06 -1,16127852E-05 -3,01878111E-05 A14 = -5,19474180E-06 -1,17146337E-07 5,17897685E-07 1,98366348E-06 A16 = 4,79392343E-07 2,98267625E-09 -1,51062642E-08 -9,32850562E-08 A18 = -3,14123692E-08 -4,70988322E-11 2,80274355E-10 3,08999237E-09 A20 = 1,37715182E-09 4,74812428E-13 -3,07500264E-12 -7,01051714E-11 A22 = -3,58833779E-11 -2,94168463E-15 1,67054517E-14 1,03418972E-12 A24 = 4,15455399E-13 - -2,48817019E-17 -8,92110209E-15 A26 = - - - 3,41074311E-17

[0202] In the 9th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 9C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 9th embodiment; therefore, no further explanation is given in this regard.

[0203] Furthermore, these parameters from Table 9A and Table 9B can be calculated as the following values ​​and must meet the following conditions: TABLE 9C Werte der optischen und physikalischen Parameter / Definitionen f [mm] 8,01 R16 / BL 1,09 Fno 1,87 T12 / T23 0,87 HFOV [Grad] 40,4 (CT5+T56) / CT6 0,51 FOV [Grad] 80,8 ATmax / CT7 1,59 TL / f 1,45 T67 / T78 0,34 ImgH / EPD 1,62 V2 / V3 0,51 f / f12 0,12 V5 / V3 0,51 f5 / f1 -2,55 ET6 / CT6 0,31 f6 / f1 0,77 ET78 / ET67 0,22 f5 / f6 -3,31 ET7 / ET8 2,21 R14 / R1 0,81 Y6R1 / Y7R2 0,59 R4 / R6 -0,40 SAG3R1 / SAG3R2 -0,36 |R15 / R9| 0,05 SAG7R2 / CT7 0,83 10. Design

[0204] Fig. Figure 19 is a perspective view of an image acquisition unit according to the 10th embodiment of the present disclosure. In this embodiment, an image acquisition unit 100 is a camera module comprising a lens unit 101, a drive device 102, an image sensor 103, and an image stabilizer 104. The lens unit 101 comprises the optical lens system for photography disclosed in the 1st embodiment, a tube, and a retaining element (whose reference numerals have been omitted) for holding the optical lens system for photography. However, the lens unit 101 can alternatively be provided with the optical lens system for photography disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light is focused in the lens unit 101 of the image acquisition unit 100 to generate an image with the drive device 102, which is used for image focusing on the image sensor 103, and the generated image is then digitally transmitted to other electronic components for further processing.

[0205] The drive unit 102 can have an autofocus function and can use various drive configurations, such as voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The drive unit 102 is advantageous for achieving a better image position for the lens unit 101, enabling the lens unit 101 to capture a clear image of the object at different distances. The image sensor 103 (e.g., CMOS or CCD), which can be characterized by high light sensitivity and low noise, is positioned on the image surface of the optical lens system for photography to achieve higher image quality.

[0206] The image stabilizer 104, comprising, for example, an accelerometer, a gyroscope, and a Hall-effect sensor, is designed to work in conjunction with the drive unit 102 to achieve optical image stabilization (OIS). The drive unit 102, working in conjunction with the image stabilizer 104, is suitable for compensating for panning and tilting movements of the lens unit 101 to reduce motion blur during exposure. In some cases, compensation can be achieved through electronic image stabilization (EIS) using image processing software, thereby improving image quality in dynamic or low-light scenarios. 11. Design

[0207] Fig. Figure 20 is a schematic view of an electronic device according to the 11th embodiment of the present disclosure, and Fig. Figure 21 is another schematic view of the electronic device in Fig. 20.

[0208] In this embodiment, an electronic device 200 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100a, an image acquisition unit 100b, an image acquisition unit 100c, and a display module 201 disclosed in the 10th embodiment. As in Fig. As shown in Figure 20, the image acquisition unit 100, the image acquisition unit 100a, and the image acquisition unit 100b are arranged on the same side of the electronic device 200, and each of the image acquisition units 100, 100a, and 100b has a single focal point. As shown in Fig. As shown in Figure 21, the image acquisition unit 100c and the display module 201 are arranged on the opposite side of the electronic device 200, so that the image acquisition unit 100c can serve as the front camera of the electronic device 200 for taking selfies, although the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100a, 100b, and 100c can comprise the optical lens system for photography described in the present disclosure and have a similar configuration to the image acquisition unit 100. Specifically, each of the image acquisition units 100a, 100b, and 100c can comprise a lens unit, a drive device, an image sensor, and an image stabilizer. In addition, each lens unit of the image acquisition units 100a, 100b, and 100c can comprise the optical lens system for photography described in the present disclosure, a tube, and a retaining element for holding the optical lens system for photography.

[0209] Image capture unit 100 is a wide-angle image capture unit, image capture unit 100a is a telephoto image capture unit, image capture unit 100b is an ultra-wide-angle image capture unit, and image capture unit 100c is a wide-angle image capture unit. In this embodiment, image capture units 100, 100a, and 100b have different fields of view, so that the electronic device can have 200 different magnification ratios to meet the requirement of the optical zoom function. Furthermore, image capture unit 100c, as shown in Fig. Figure 21 shows that the image acquisition unit 100c has a non-circular aperture, and the tube or lens elements in the image acquisition unit 100c may have clipped edges at their outermost positions to conform to the shape of the non-circular aperture. Therefore, it is advantageous to reduce the size of the image acquisition unit 100c, to increase the ratio of the area of ​​the display module 201 to that of the electronic device 200, and to reduce the thickness of the electronic device 200, thereby achieving module miniaturization.

[0210] In this embodiment, the electronic device 200 comprises several image acquisition units 100, 100a, 100b and 100c, but the present disclosure is not limited to the number and arrangement of the image acquisition units. 12. Design

[0211] Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure, Fig. Figure 23 is another perspective view of the electronic device in Fig. 22 and Fig. 24 is a block diagram of the electronic device in Fig. 22.

[0212] In this embodiment, an electronic device 300 is a smartphone comprising the image acquisition unit 100 according to the 10th embodiment, an image acquisition unit 100d, an image acquisition unit 100e, an image acquisition unit 100f, an image acquisition unit 100g, a flash module 301, a focusing aid module 302, an image signal processor 303, a display module 304, and an image software processor 305. The image acquisition unit 100 and the image acquisition unit 100d are arranged on the same side of the electronic device 300. The focusing aid module 302 can be a laser distance meter or a ToF (Time of Flight) module, but the present disclosure is not limited to this.The image acquisition unit 100e, the image acquisition unit 100f, the image acquisition unit 100g, and the display module 304 are arranged on the opposite side of the electronic device 300, and the display module 304 can serve as a user interface, so that the image acquisition units 100e, 100f, and 100g can serve as front cameras of the electronic device 300 for taking selfies, but the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100d, 100e, 100f, and 100g can include the optical lens system for photography of the present disclosure and have a similar configuration to the image acquisition unit 100. Specifically, each of the image acquisition units 100d, 100e, 100f, and 100g can include a lens unit, a drive device, an image sensor, and an image stabilizer.Furthermore, each lens unit of the image acquisition units 100d, 100e, 100f and 100g can comprise the optical lens system for photography of the present disclosure, a tube and a holding element for holding the optical lens system for photography.

[0213] Image acquisition unit 100 is a wide-angle image acquisition unit, image acquisition unit 100d is an ultra-wide-angle image acquisition unit, image acquisition unit 100e is a wide-angle image acquisition unit, image acquisition unit 100f is an ultra-wide-angle image acquisition unit, and image acquisition unit 100g is a time-of-flight (ToF) image acquisition unit. In this embodiment, image acquisition units 100 and 100d have different fields of view, so that the electronic device 300 can have different magnification ratios to meet the requirement of the optical zoom function. In addition, image acquisition unit 100g can acquire depth information of the imaged object. In this embodiment, the electronic device 300 comprises multiple image acquisition units 100, 100d, 100e, 100f, and 100g, but the present disclosure is not limited to the number and arrangement of the image acquisition units.

[0214] When a user takes pictures of an object 306, the light rays are focused in the image acquisition unit 100 or the image acquisition unit 100d to produce images, and the flash module 301 is activated for light support. The focus assist module 302 detects the object distance of the imaged object 306 to achieve fast autofocus. The image signal processor 303 is designed to optimize the captured image to improve image quality. The light emitted by the focus assist module 302 can be either conventional infrared light or laser light. Additionally, the light rays are focused in the image acquisition unit 100e, 100f, or 100g to produce images. The display module 304 can include a touchscreen, and the user can interact with the display module 304 and the multi-functional image software processor 305 to capture images and perform image processing.Alternatively, the user can take pictures using a physical button. The image processed by the 305 image software processor can be displayed on the 304 display module. 13. Design

[0215] Fig. Figure 25 is a perspective view of an electronic device according to the 13th embodiment of the present disclosure.

[0216] In this embodiment, an electronic device 400 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100h, an image acquisition unit 100i, a flash module 401, a focusing aid module, an image signal processor, a display module, and an image software processor (not shown) disclosed in the 10th embodiment. The image acquisition units 100, 100h, and 100i are arranged on the same side of the electronic device 400, while the display module is arranged on the opposite side of the electronic device 400. Furthermore, each of the image acquisition units 100h and 100i can include the optical lens system for photography of the present disclosure and have a similar configuration to the image acquisition unit 100, the details of which are not repeated here.

[0217] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100h is a telephoto image acquisition unit, and the image acquisition unit 100i is an ultra-wide-angle image acquisition unit. In this embodiment, the image acquisition units 100, 100h, and 100i have different fields of view, so that the electronic device 400 can have different magnification ratios to meet the requirements of the optical zoom function. Furthermore, the image acquisition unit 100h is a telephoto image acquisition unit configured with a beam path deflection element, which means that the overall path length of the image acquisition unit 100h is not limited by the thickness of the electronic device 400. Moreover, the light deflection configuration of the image acquisition unit 100h can, for example, be that described in Fig. The configuration shown in 31 may be similar, for which reference is made to the preceding descriptions. Fig. Reference can be made to Section 31, and the details relating thereto are not repeated. In this embodiment, the electronic device 400 comprises several image acquisition units 100, 100h, and 100i, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light beams are focused in the image acquisition unit 100, 100h, or 100i to produce images, and the flash module 401 is activated to assist the lighting. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, and the details relating thereto are not repeated. 14. Design

[0218] Fig. Figure 26 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure.

[0219] In this embodiment, an electronic device 500 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100j, an image acquisition unit 100k, an image acquisition unit 100m, an image acquisition unit 100n, an image acquisition unit 100p, an image acquisition unit 100q, an image acquisition unit 100r, an image acquisition unit 100s, a flash module 501, a focusing aid module, an image signal processor, a display module and an image software processor (not shown) disclosed in the 10th embodiment. The image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s are arranged on the same side of the electronic device 500, while the display module is arranged on the opposite side of the electronic device 500.Furthermore, each of the image acquisition units 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s can comprise the optical lens system for photography of the present disclosure and have a similar configuration to the image acquisition unit 100, without the details relating thereto being specified again.

[0220] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100j is a telephoto image acquisition unit, the image acquisition unit 100k is a telephoto image acquisition unit, the image acquisition unit 100m is a wide-angle image acquisition unit, the image acquisition unit 100n is an ultra-wide-angle image acquisition unit, the image acquisition unit 100p is an ultra-wide-angle image acquisition unit, the image acquisition unit 100q is a telephoto image acquisition unit, the image acquisition unit 100r is a telephoto image acquisition unit, and the image acquisition unit 100s is a ToF image acquisition unit. In this embodiment, the image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q and 100r have different fields of view, so that the electronic device can have 500 different magnification ratios to meet the requirement of the optical zoom function.Furthermore, both the 100j and 100k image acquisition units are telephoto image acquisition units configured with a beam deflection element. In addition, the light deflection configuration of the 100j and 100k image acquisition units can be, for example, the one described in [reference missing]. Fig. The configuration shown in 31 may be similar, for which reference is made to the preceding descriptions. Fig. Reference can be made to Section 31, and the relevant details are not stated again. Furthermore, the image acquisition unit 100s can acquire depth information of the imaged object. In this embodiment, the electronic device 500 comprises multiple image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light rays are focused in the image acquisition unit 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, or 100s to produce images, and the flash module 501 is activated to assist the lighting. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, and the details thereof are not specified again. 15. Design

[0221] Fig. Figure 27 is a schematic view of an electronic device according to the 15th embodiment of the present disclosure.

[0222] In this embodiment, an electronic device 600 is a compact camera, for example, an action camera. The electronic device 600 comprises a screen 601 and an image acquisition unit 602. The image acquisition unit 602 is electrically connected to the screen 601. The image acquisition unit 602 includes the optical lens system for photography disclosed in the first embodiment. The image acquisition unit 602 can be a wide-angle image acquisition unit. Similar to the image acquisition unit 100, the image acquisition unit 602 can further comprise a tube, a holding element, or a combination thereof. The electronic device 600 uses the image acquisition unit 602 for functions such as taking photographs. Preferably, the electronic device can further comprise a control unit, a display unit, a storage unit, a working memory (RAM), or a combination thereof. 16. Design

[0223] Fig.Figure 28 is a schematic view of an electronic device according to the 16th embodiment of the present disclosure.

[0224] In this embodiment, an electronic device 700 is a compact camera, for example, a handheld camera. The electronic device 700 comprises a screen 701 and an image acquisition unit 702. The image acquisition unit 702 is electrically connected to the screen 701. The image acquisition unit 702 includes the optical lens system for photography disclosed in the first embodiment. The image acquisition unit 702 can be a wide-angle image acquisition unit. Similar to the image acquisition unit 100, the image acquisition unit 702 can further comprise a tube, a holding element, or a combination thereof. The electronic device 700 uses the image acquisition unit 702 for functions such as taking photographs. Preferably, the electronic device can further comprise a control unit, a display unit, a storage unit, a working memory (RAM), or a combination thereof.

[0225] The smartphones and compact cameras in the embodiments serve only as examples to illustrate the image acquisition unit installed in an electronic device according to the present disclosure, and the present disclosure is not limited to them. The image acquisition unit can optionally be applied to optical systems with movable focus. Furthermore, the optical lens system for photographing the image acquisition unit is characterized by good aberration correction capability and high image quality and can be used for 3D image acquisition applications (three-dimensional image acquisition applications) in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle reversing cameras, multi-camera devices, image recognition systems, motion sensor input devices, portable devices, and other electronic imaging devices.

[0226] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that TABLES 1A-9C show different data for the various embodiments; however, the data for the different embodiments were obtained experimentally. The embodiments were selected and described to best illustrate the principles of the disclosure and their practical applications, so that other skilled persons may make the best possible use of the disclosure and various embodiments with different modifications suitable for their respective intended uses. The embodiments shown above and the accompanying drawings are exemplary and are neither intended to be exhaustive nor to limit the scope of this disclosure to the forms exactly disclosed. In view of the above teachings, many modifications and variations are possible.

Claims

[1] Optical lens system for photography with eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fifth lens element (E5) has a negative refractive power, the image-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, the object-side surface of the seventh lens element (E7) is convex in a paraxial region thereof, the image-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, the image-side surface of the seventh lens element (E7) has at least one inflection point (P), the eighth lens element (E8) has a negative refractive power, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, the image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) has at least one inflection point (P); where the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fifth lens element (E5) is V5, the axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67, the axial distance between the seventh lens element (E7) and the eighth lens element (E8) is T78, and the following conditions are met: -2.50 <R14 / R1<1,10; 0.20 <V5 / V3<0,70; und 0 <T67 / T78<0,60. [2] Optical lens system for photography according to claim 1, wherein the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the third lens element (E3) has a positive refractive power, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the object-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, and the sixth lens element (E6) has a positive refractive power. [3] Optical lens system for photography according to claim 1, wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) TL is, a focal length of the optical lens system f is and the following condition is met: 1.40 <TL / f<2,70. [4] Optical lens system for photography according to claim 1, wherein a focal length of the optical lens system f is, a composite focal length of the first lens element (E1) and the second lens element (E2) is f12 and the following condition is met: -0.50 <f / f12<0,50. [5] Optical lens system for photography according to claim 1, wherein the image-side surface of the eighth lens element (E8) has at least one critical point (C) in an off-axis region thereof; and where the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14 and the following condition is met: -1.80 <R14 / R1<1,00. [6] Optical lens system for photography according to claim 1, wherein the Abbe number of the second lens element (E2) is V2, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fifth lens element (E5) is V5 and the following conditions are met: 0.20 <V2 / V3<1,00; und 0.28 <V5 / V3<0,55. [7] Optical lens system for photography according to claim 1, wherein each of at least four lens elements in the optical lens system has a refractive index of less than 1.75; and where the axial distance between the first lens element (E1) and the second lens element (E2) is T12, the axial distance between the second lens element (E2) and the third lens element (E3) is T23, and the following condition is met: 0 <T12 / T23<2,00. [8] Optical lens system for photography according to claim 1, wherein a radius of curvature of the object-side surface of the fifth lens element (E5) is R9, a radius of curvature of the object-side surface of the eighth lens element (E8) is R15 and the following condition is met: 0<|R15 / R9|<0.

80. [9] Optical lens system for photography according to claim 1, wherein the focal length of the first lens element (E1) is f1, the focal length of the sixth lens element (E6) is f6 and the following condition is met: -0.80 <f6 / f1<4,00. [10] Optical lens system for photography according to claim 1, wherein a maximum image height of the optical lens system is ImgH, an entrance pupil diameter of the optical lens system for photography is EPD, the axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67, the axial distance between the seventh lens element (E7) and the eighth lens element (E8) is T78 and the following conditions are met: 1.45 <ImgH / EPD<2,40; und 0.01 <T67 / T78<0,40. [11] Optical lens system for photography according to claim 1, wherein a radius of curvature of the image-side surface of the second lens element (E2) is R4, a radius of curvature of the image-side surface of the third lens element (E3) is R6 and the following condition is met: -1.30 <R4 / R6<0,10. [12] Optical lens system for photography according to claim 1, wherein a distance parallel to an optical axis between a position of the maximum effective radius of the image-side surface of the sixth lens element (E6) and a position of the maximum effective radius of the object-side surface of the seventh lens element (E7) is ET67, a distance parallel to the optical axis between a position of the maximum effective radius of the image-side surface of the seventh lens element (E7) and a position of the maximum effective radius of the object-side surface of the eighth lens element (E8) is ET78 and the following condition is met: 0.05 <ET78 / ET67<0,65. [13] Optical lens system for photography according to claim 1, wherein a displacement parallel to an optical axis from an axial vertex of the object-side surface of the third lens element (E3) to a position of the maximum effective radius of the object-side surface of the third lens element (E3) is SAG3R1, a displacement parallel to the optical axis from an axial vertex of the image-side surface of the third lens element (E3) to a position of the maximum effective radius of the image-side surface of the third lens element (E3) is SAG3R2, a displacement parallel to the optical axis from an axial vertex of the image-side surface of the seventh lens element (E7) to a position of the maximum effective radius of the image-side surface of the seventh lens element (E7) is SAG7R2, a central thickness of the seventh lens element (E7) is CT7 and the following conditions are met: -1.00 <SAG3R1 / SAG3R2<0,35; und -0.30 <SAG7R2 / CT7<1,20. [14] Image capture unit (1, 100), comprising: the optical lens system for photography according to claim 1; and an image sensor (IS, 103) which is arranged on an image surface (IMG) of the optical lens system for photography. [15] Optical lens system for photography with eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the third lens element (E3) has a positive refractive power, the image-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, the object-side surface of the seventh lens element (E7) is convex in a paraxial region thereof, the image-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, the object-side surface of the seventh lens element (E7) has at least one inflection point (P), the eighth lens element (E8) has a negative refractive power, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof; where the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14, the central thickness of the fifth lens element (E5) is CT5, the central thickness of the sixth lens element (E6) is CT6, the central thickness of the seventh lens element (E7) is CT7, the axial distance between the fifth lens element (E5) and the sixth lens element (E6) is T56, the maximum value of all axial distances between each of all adjacent lens elements of the optical lens system is ATmax, and the following conditions are met: -2.00 <R14 / R1<1,00; 0.10<(CT5+T56) / CT6<0.90; and 0.40 <ATmax / CT7<2,20. [16] Optical lens system for photography according to claim 15, wherein the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the object-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the fifth lens element (E5) has a negative refractive power, the sixth lens element (E6) has a positive refractive power, and the object-side surface of the seventh lens element (E7) has at least one critical point (C) in an off-axis region thereof. [17] Optical lens system for photography according to claim 15, wherein the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14, a maximum image height of the optical lens system is ImgH, an entrance pupil diameter of the optical lens system is EPD and the following conditions are met: -1.50 <R14 / R1<0,95; und 1.55 <ImgH / EPD<2,30. [18] Optical lens system for photography according to claim 15, wherein the focal length of the fifth lens element (E5) is f5, the focal length of the sixth lens element (E6) is f6, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fifth lens element (E5) is V5 and the following conditions are met: -5.00 <f5 / f6<0; und 0.25 <V5 / V3<0,60. [19] Optical lens system for photography according to claim 15, wherein a focal length of the first lens element (E1) is f1, a focal length of the fifth lens element (E5) is f5 and the following condition is met: -4.00 <f5 / f1<0,50. [20] Optical lens system for photography according to claim 15, wherein the central thickness of the fifth lens element (E5) is CT5, the central thickness of the sixth lens element (E6) is CT6, the axial distance between the fifth lens element (E5) and the sixth lens element (E6) is T56 and the following condition is met: 0.15<(CT5+T56) / CT6<0.

70. [21] Optical lens system for photography according to claim 15, wherein at least five lens elements in the optical lens system for photography are made of plastic material; and where the maximum value among all axial distances between each of all adjacent lens elements of the optical lens system is ATmax, the central thickness of the seventh lens element (E7) is CT7, and the following condition is satisfied: 0.60 <ATmax / CT7<1,80. [22] Optical lens system for photography according to claim 15, wherein a focal length of the first lens element (E1) is f1, a focal length of the sixth lens element (E6) is f6 and the following condition is met: -0.70 <f6 / f1<3,50. [23] Optical lens system for photography according to claim 15, wherein a radius of curvature of the image-side surface of the eighth lens element (E8) is R16, an axial distance between the image-side surface of the eighth lens element (E8) and an image surface (IMG) is BL, an axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67, an axial distance between the seventh lens element (E7) and the eighth lens element (E8) is T78 and the following conditions are met: 0.60 <R16 / BL<2,00; und 0.01 <T67 / T78<0,20. [24] Optical lens system for photography according to claim 15, wherein a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the sixth lens element (E6) and a position of the maximum effective radius of the image-side surface of the sixth lens element (E6) is ET6, the central thickness of the sixth lens element (E6) is CT6 and the following condition is met: 0.15 <ET6 / CT6<0,80. [25] Optical lens system for photography according to claim 15, wherein a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the seventh lens element (E7) and a position of the maximum effective radius of the image-side surface of the seventh lens element (E7) is ET7, a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the eighth lens element (E8) and a position of the maximum effective radius of the image-side surface of the eighth lens element (E8) is ET8, a maximum effective radius of the object-side surface of the sixth lens element (E6) is Y6R1, a maximum effective radius of the image-side surface of the seventh lens element (E7) is Y7R2, and the following conditions are met: 0.75 <ET7 / ET8<2,50; und 0.50 <Y6R1 / Y7R2<0,75. [26] Optical lens system for photography according to claim 15, wherein the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the seventh lens element (E7) is R14, an Abbe number of the third lens element (E3) is V3, an Abbe number of the fifth lens element (E5) is V5, the axial distance between the fifth lens element (E5) and the sixth lens element (E6) is T56, an axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67, an axial distance between the seventh lens element (E7) and the eighth lens element (E8) is T78, the central thickness of the fifth lens element (E5) is CT5, the central thickness of the sixth lens element (E6) is CT6, the central thickness of the seventh lens element (E7) is CT7, ATmax is the maximum value of all axial distances between each of all adjacent lens elements of the optical lens system.an axial distance between the image-side surface of the first lens element (E1) and an image surface (IMG) TL is, a focal length of the optical lens system for photography is f, a maximum image height of the optical lens system is ImgH, an entrance pupil diameter of the optical lens system for photography is EPD, and the following conditions are met: −1.34≤R14 / R1≤0.81; 0.33≤V5 / V3≤0.51; 0.02≤T67 / T78≤0.34; 0.25≤(CT5+T56) / CT6≤0.51; 0.87≤ATmax / CT7≤1.70; 1.45≤TL / f≤2.36; and 1.62≤ImgH / EPD≤2.

05. [27] Electronic device (200) comprising: comprising one image acquisition unit (1, 100): the optical lens system for photography according to claim 15; and an image sensor (IS, 103) which is arranged on an image surface (IMG) of the optical lens system for photography.

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