Optical lens assembly for photography, image acquisition unit and electronic device

Abstract

Optical lens assembly for photography comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a negative refractive power, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the sixth lens element (E6) has a negative refractive power, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, 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 sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), measured at a reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the central thickness of the first lens element (E1) is CT1, the central thickness of the third lens element (E3) is CT3, the central thickness of the seventh lens element (E7) is CT7, the axial distance between the second lens element (E2) and the third lens element (E3) is T23, and the following conditions are met: 0 < (R 11 + R 12 ) / ( R 11 − R 12 ) < 1.50 ; 4,00 < TLd / ImgH < 6,50 ; 6,00 < TLd / fd < 12,00 ; 0,10 < CT 1 / CT 7 < 0,80 ; und 0,60 < T 23 / CT 3 < 2,00.

Description

BACKGROUND Subject area

[0001] The present disclosure relates to an optical lens assembly for photography, an image acquisition unit and an electronic device, in particular an optical lens assembly 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 assembly 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 first lens element has a negative refractive power. Preferably, the image-side surface of the second lens element is concave in a paraxial region. Preferably, the image-side surface of the fourth lens element is convex in a paraxial region. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the image-side surface of the fifth lens element is convex in a paraxial region. Preferably, the sixth lens element has a negative refractive power. Preferably, the image-side surface of the sixth lens element is concave in a paraxial region. Preferably, the seventh lens element has a positive refractive power. 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 sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, the axial distance between the object-side surface of the first lens element and an image surface, measured at a reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the central thickness of the first lens element is CT1, the central thickness of the third lens element is CT3, the central thickness of the seventh lens element is CT7, and the axial distance between the second lens element and the third lens element is T23, then the following conditions are preferably met: 0<(R11+R12) / (R11−R12)<1.50; 4.00 <TLd / ImgH<6,50; 6.00 <TLd / fd<12,00; 0.10 <CT1 / CT7<0,80; und 0.60 <T23 / CT3<2,00.

[0007] According to another aspect of the present disclosure, an optical lens assembly 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 first lens element has a negative refractive power. Preferably, the image-side surface of the second lens element is concave in a paraxial region. Preferably, the fourth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the sixth lens element has a negative refractive power. Preferably, the object-side surface of the sixth lens element is concave in a paraxial region. Preferably, the image-side surface of the sixth lens element is concave in a paraxial region. Preferably, the seventh lens element has a positive refractive power. 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.

[0009] If a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the object-side surface of the sixth lens element is R11, a radius of curvature of the image-side surface of the sixth lens element is R12, a radius of curvature of the object-side surface of the eighth lens element is R15, a radius of curvature of the image-side surface of the eighth lens element is R16, an axial distance between the object-side surface of the first lens element and an image surface, measured at a reference wavelength of the d-line, is TLd, a maximum image height of the optical lens assembly for photography is ImgH, a focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, a focal length of the first lens element, measured at the reference wavelength of the d-line, is f1d, and the focal length of the second lens element, measured at the reference wavelength of the d-line, f2d iswhere the focal length of the third lens element, measured at the reference wavelength of the d-line, is f3d, the focal length of the fourth lens element, measured at the reference wavelength of the d-line, is f4d, the focal length of the fifth lens element, measured at the reference wavelength of the d-line, is f5d, the focal length of the sixth lens element, measured at the reference wavelength of the d-line, is f6d, the focal length of the seventh lens element, measured at the reference wavelength of the d-line, is f7d, the focal length of the eighth lens element, measured at the reference wavelength of the d-line, is f8d, and the focal length of the i-th lens element, measured at the reference wavelength of the d-line, is fid, the following conditions are preferably met: 0<(R11+R12) / (R11−R12)<0.90; 4.00 <TLd / ImgH<6,50; 1.00<∑|fd / fid|<4.00,where i=1,2,3,4,5,6,7 and 8; 0.65 < |fd / R15| + |fd / R16| < 2.00; and 0.25<|f1d / R1|<1.00.

[0010] According to another aspect of the present disclosure, an image acquisition unit comprises one of the above-mentioned optical lens assemblies and an image sensor, wherein the image sensor is arranged on the image surface of the optical lens assembly.

[0011] According to another aspect of the present disclosure, an electronic device comprises the aforementioned image capture unit. BRIEF DESCRIPTION OF THE DRAWINGS9---

[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 representation 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 perspective view of an image acquisition unit according to the 8th embodiment of the present disclosure; Fig. Figure 16 is a perspective view of an electronic device according to the 9th embodiment of the present disclosure; Fig. Figure 17 is another perspective view of the electronic device in Fig. 16; Fig. Figure 18 is a perspective view of an electronic device according to the 10th embodiment of the present disclosure; Fig. Figure 19 is another perspective view of the electronic device in Fig. 18; Fig. 20 is a block diagram of the electronic device in Fig. 18; Fig. Figure 21 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure; Fig.Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Fig. Figure 23 is a schematic view of an electronic device according to the 13th embodiment of the present disclosure; Fig. Figure 24 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure; Fig. 25 is a side view of the electronic device in Fig. 24; Fig. 26 is a top view of the electronic device in Fig. 24; 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 Y1R1d, Y5R1d and Sag2R1d according to the first embodiment of the present disclosure; Fig. Figure 30 shows a schematic view of inflection points on lens surfaces and critical points on lens surfaces according to the first embodiment of the present disclosure; Fig. Figure 31 shows a schematic view of a configuration of a light deflection element in an optical lens assembly for photography according to an embodiment of the present disclosure; Fig. Figure 32 shows a schematic view of a further configuration of a light deflection element in an optical lens assembly for photography according to an embodiment of the present disclosure; and Fig. Figure 33 shows a schematic view of a configuration of two light deflection elements in an optical lens assembly for photography according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0013] An optical lens assembly 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 has an object-side surface facing the object side and an image-side surface facing the image side.

[0014] The first lens element can have a negative refractive power. This is advantageous for increasing the field of view and capturing a relatively large area of ​​image information. The object-side surface of the first lens element can be convex in a paraxial region. This is advantageous for increasing the viewing angle and image size. The image-side surface of the first lens element can be concave in a paraxial region. This is advantageous for adjusting the direction of light propagation with a relatively large field of view, thereby reducing glare and stray light.

[0015] The second lens element can have a negative refractive power. Therefore, it is advantageous to help balance the refractive power of the first lens element while simultaneously correcting off-axis aberrations. The object-side surface of the second lens element can be convex in a paraxial region. This is advantageous for adjusting the lens shape and refractive power, thereby improving image quality in the central image. The image-side surface of the second lens element can be concave in a paraxial region. This is advantageous for adjusting the angle of incidence of light across a relatively large field of view from the object end to the image end of the optical lens assembly for photography, thus improving the focusing quality of the light at the edges.

[0016] The third lens element can have a positive refractive power. Therefore, it is advantageous to help balance the refractive powers of the first and second lens elements, thereby correcting the spherical aberration of the optical lens assembly for photography. The image-side surface of the third lens element can be convex in a paraxial region. This is advantageous for controlling the direction of light propagation at the edge of the third lens element, thus preventing ineffective light focusing due to insufficient deflection of the light at the edge.

[0017] The fourth lens element can have a positive refractive power. Therefore, it is advantageous for focusing the light. The image-side surface of the fourth lens element can be convex in a paraxial region. Therefore, it is advantageous for adjusting the emission direction of the light from the fourth lens element, thus facilitating the magnification of the image area.

[0018] The fifth lens element can have a positive refractive power. Therefore, it is advantageous to balance the refractive powers of the fourth and sixth lens elements, improve the focusing quality of light from different fields of view onto the image surface, and correct aberrations. The object-side surface of the fifth lens element can be convex in a paraxial region. Therefore, it is advantageous to compensate for the angle of incidence of light with a relatively large field of view into the fifth lens element, thus preventing light scattering. The image-side surface of the fifth lens element can also be convex in a paraxial region. Therefore, it is advantageous to give the fifth lens element light-focusing capability, thus preventing scattered light due to an excessively large angle of incidence at the edge.

[0019] The sixth lens element can have a negative refractive power. Therefore, it is advantageous for balancing the refractive powers of the lens elements at the image end of the optical lens assembly for photography and for reducing the back focal length. The object-side surface of the sixth lens element can be concave in a paraxial region. Therefore, it is beneficial for correcting field curvature while simultaneously reducing the back focal length. The image-side surface of the sixth lens element can also be concave in a paraxial region. Therefore, it is beneficial for effectively controlling the direction of light propagation with a relatively large field of view and reducing the angle of incidence of the light onto the image area, thereby increasing the illuminance at the peripheral field of view.

[0020] The seventh lens element can have a positive refractive power. Therefore, it is advantageous for focusing light, effectively controlling the direction of the beam path, and achieving a suitable balance between the field of view and the size distribution. The object-side surface of the seventh lens element can be convex in a paraxial region. Therefore, it is advantageous for adjusting the rear focal length in conjunction with the eighth lens element, thus preventing an excessively large lens size and reducing the difficulty of miniaturizing the device.

[0021] The image-side surface of the eighth lens element can be concave in a paraxial region. Therefore, it is advantageous for correcting field curvature while simultaneously reducing the rear focal length.

[0022] According to the present disclosure, the image-side surface of the eighth lens element can have at least one inflection point. Therefore, it is advantageous to improve the aberration correction capability of the eighth lens element at the image edge. See Fig. Figure 30 shows a schematic view of an inflection point P on the image-side surface of the eighth lens element E8 according to the first embodiment of the present disclosure. The aforementioned inflection point P on the image-side surface of the eighth lens element E8, as well as inflection points P on the image-side surface of the second lens element E2, the object-side surface of the third lens element E3, the object-side surface of the fifth lens element E5, the image-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 in Fig.The 30 are only examples. Each of the lens surfaces in different embodiments of the present disclosure may also have one or more inflection points.

[0023] According to the present disclosure, the image-side surface of the eighth lens element can have at least one critical point in an off-axis region thereof. Therefore, it is advantageous for adjusting the angle of incidence of light onto the image surface, controlling the angle of light at the edge, preventing vignetting at the image edge, and correcting distortions. See Fig.Figure 30, which shows a schematic view of a critical point C on the image-side surface of the eighth lens element E8 according to the first embodiment of the present disclosure. The aforementioned critical point C on the image-side surface of the eighth lens element E8, as well as critical points C on the object-side surface of the third lens element E3, the object-side surface of the fifth lens element E5, and the object-side surface of the eighth lens element E8 in Fig. Figure 30 are only examples. Each of the lens surfaces in different embodiments of the present disclosure may also have one or more critical points in an off-axis region thereof.

[0024] According to the present disclosure, the first lens element can be made of glass material. Therefore, a suitable selection of the glass material is advantageous to effectively reduce sensitivity to environmental factors, and the glass material exhibits high stability in various scenarios, making it resistant to humid environments, preventing surface scratches, and thus effectively extending the service life of the applied electronic products.

[0025] According to the present disclosure, the eight lens elements can comprise at least one positive lens element, and the Abbe number of the at least one positive lens element can be less than 30.0. Therefore, it is advantageous to effectively concentrate the focusing positions of light with different wavelengths and thereby increase the image resolution. Furthermore, the Abbe number of the at least one positive lens element can also be less than 26.0. Furthermore, the Abbe number of the at least one positive lens element can also be less than 24.0. Furthermore, the Abbe number of the at least one positive lens element can also be less than 22.0. Furthermore, the Abbe number of the at least one positive lens element can also be less than 20.0.

[0026] If the radius of curvature of the object-side surface of the sixth lens element is R11 and the radius of curvature of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: 0 < (R11 + R12) / (R11 - R12) < 1.50. Therefore, it is advantageous to effectively balance the radius of curvature of the object-side surface of the sixth lens element with the radius of curvature of the image-side surface of the sixth lens element, thereby improving the focusing quality of the imaged light and effectively correcting field curvature and spherical aberration. Furthermore, the following condition can also be satisfied: 0.05 < (R11 + R12) / (R11 - R12) < 1.30. Furthermore, the following condition can also be met: 0.13 ≤ (R11+R12) / (R11-R12) ≤ 1.21. Furthermore, the following condition can also be met: 0 < (R11+R12) / (R11-R12) < 0.90. Furthermore, the following condition can also be met: 0.10 < (R11 +R12) / (R11-R12) < 0.70.Furthermore, the following condition can also be met: 0.10 < (R11+R12) / (R11-R12) < 0.65. Furthermore, the following condition can also be met: 0.20 < (R11 +R12) / (R11-R12) < 0.60.

[0027] If the axial distance between the object-side surface of the first lens element and the image surface, measured at a reference wavelength of the d-line, is TLd, and the maximum image height of the optical lens assembly for photography (which can be half the diagonal length of an effective light-sensitive area of ​​the image sensor) is ImgH, the following condition can be satisfied: 4.00 < TLd / ImgH < 6.50. Therefore, it is advantageous to achieve a reasonable balance between maintaining the overall path length of the optical lens assembly for photography and increasing the image surface area. Furthermore, the following conditions can also be satisfied: 4.50 < TLd / ImgH < 6.30. Furthermore, the following conditions can also be satisfied: 4.80 < TLd / ImgH < 6.15. Furthermore, the following condition can also be satisfied: 5.00 ≤ TLd / ImgH ≤ 6.07.

[0028] If the axial distance between the object-side surface of the first lens element and the image surface, measured at the reference wavelength of the d-line, is TLd, and the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the following condition can be satisfied: 6.00 < TLd / fd < 12.00. Therefore, it is advantageous to achieve a reasonable balance between the total path length and the field of view of the optical lens assembly for photography, thus facilitating the formation of a wide-angle characteristic. Furthermore, the following conditions can also be satisfied: 7.00 < TLd / fd < 10.00. Furthermore, the following conditions can also be satisfied: 7.40 < TLd / fd < 9.00. Furthermore, the following conditions can also be satisfied: 7.72 ≤ TLd / fd ≤ 9.56.

[0029] If the central thickness of the first lens element is CT1 and the central thickness of the seventh lens element is CT7, the following condition can be satisfied: 0.10 < CT1 / CT7 < 0.80. Therefore, it is advantageous to balance the central thicknesses of the first and seventh lens elements, thus balancing the spatial arrangement between the lens elements at the object end and the lens elements at the image end of the optical lens assembly for photography. Furthermore, the following conditions can also be satisfied: 0.20 < CT1 / CT7 < 0.65. Additionally, the following conditions can also be satisfied: 0.30 < CT1 / CT7 < 0.60. Furthermore, the following condition can also be satisfied: 0.38 ≤ CT1 / CT7 ≤ 0.55.

[0030] If the axial distance between the second and third lens elements is T23 and the central thickness of the third lens element is CT3, the following condition can be met: 0.60 < T23 / CT3 < 2.00. Therefore, it is advantageous to adjust the spatial ratio of the distance between the second and third lens elements to the central thickness of the third lens element to provide sufficient space for focusing light with a relatively large field of view, thereby improving the light focusing quality at the edge and increasing the field of view. Furthermore, the following conditions can also be met: 0.70 < T23 / CT3 < 1.80. Furthermore, the following conditions can also be met: 0.75 < T23 / CT3 < 1.60. Furthermore, the following condition can also be met: 0.81 ≤ T23 / CT3 ≤ 1.44.

[0031] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, then the focal length of the first lens element, measured at the reference wavelength of the d-line, is f1d, the focal length of the second lens element, measured at the reference wavelength of the d-line, is f2d, the focal length of the third lens element, measured at the reference wavelength of the d-line, is f3d, the focal length of the fourth lens element, measured at the reference wavelength of the d-line, is f4d, the focal length of the fifth lens element, measured at the reference wavelength of the d-line, is f5d, the focal length of the sixth lens element, measured at the reference wavelength of the d-line, is f6d, the focal length of the seventh lens element, measured at the reference wavelength of the d-line, is f7d, the focal length of the eighth lens element, measured at the reference wavelength of the d-line, is f8d, and the focal length of the i-th lens element,Measured at the reference wavelength of the d-line, fid, the following condition can be satisfied: 1.00 < Σ|fd / fid| < 4.00, where i = 1, 2, 3, 4, 5, 6, 7, and 8. Therefore, it is advantageous to adjust the sum of the refractive powers of all lens elements in such a way as to prevent excessive aberrations, especially excessive spherical aberrations caused by a relatively large field of view of incident light deflected by an excessive refractive power, thereby facilitating the enlargement of the field of view and the improvement of the focusing quality of the light from all fields of view. Furthermore, the following condition can also be satisfied: 1.50 < Σ|fd / fid| < 3.75, where i = 1, 2, 3, 4, 5, 6, 7, and 8. Furthermore, the following condition can also be satisfied: 2.00 < Σ|fd / fid| < 3.00, where i = 1, 2, 3, 4, 5, 6, 7, and 8. Furthermore, the following condition can also be satisfied: 2.16 ≤ Σ|fd / fid| ≤ 3.48, where i = 1, 2, 3, 4, 5, 6,7 and 8. It should be noted that Σ|fd / fid| can also be viewed as the sum of |fd / f1d|, |fd / f2d|, |fd / f3d|, |fd / f4d|, |fd / f5dl, |fd / f6d|, |fd / f7d| and |fd / f8d|.

[0032] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, and the radius of curvature of the object-side surface of the eighth lens element is R15 and the radius of curvature of the image-side surface of the eighth lens element is R16, then the following condition can be satisfied: 0.65 < |fd / R15| + |fd / R16| < 2.00. Therefore, it is advantageous to effectively balance the radius of curvature of the object-side surface of the eighth lens element and the radius of curvature of the image-side surface of the eighth lens element to adjust the direction of light propagation at the edge, thereby correcting the astigmatism of the optical lens assembly for photography and reducing stray light in the optical lens. Furthermore, the following condition can also be satisfied: 0.80 < |fd / R15| + |fd / R16| < 1.80. Furthermore, the following condition can also be met: 0.90 < |fd / R15|+|fd / R16| < 1.60.Furthermore, the following condition can also be met: 0.97 ≤ |fd / R15|+|fd / R16| ≤ 1.54.

[0033] If the focal length of the first lens element, measured at the reference wavelength of the d-line, is f1d, and the radius of curvature of the object-side surface of the first lens element is R1, the following condition can be satisfied: 0.25 < |f1d / R1| < 1.00. Therefore, it is advantageous to adjust the shape of the object-side surface of the first lens element to ensure that the first lens element can have an arrangement that effectively controls the beam path of the optical lens assembly for photography, thereby maintaining the photographic viewing angle and increasing the amount of incident light. Furthermore, the following condition can also be satisfied: 0.35 < |f1d / R1| < 0.85. Furthermore, the following condition can also be satisfied: 0.40 < |f1d / R1| < 0.80. Furthermore, the following condition can also be satisfied: 0.43 ≤ |f1d / R1| ≤ 0.72.

[0034] If the focal length of the second lens element, measured at the reference wavelength of the d-line, is f2d, and the focal length of the sixth lens element, measured at the reference wavelength of the d-line, is f6d, the following condition can be satisfied: 1.50 < |f2d / f6d| < 4.00. Therefore, it is advantageous to adjust the intensity ratio of the refractive powers of the second and sixth lens elements so that the propagation direction of the beam path is effectively controlled, thereby reducing the angle of incidence of the light on the image surface. Furthermore, the following condition can also be satisfied: 1.80 < |f2d / f6d| < 3.50.

[0035] If the radius of curvature of the object-side surface of the fifth lens element is R9 and the radius of curvature of the image-side surface of the eighth lens element is R16, the following condition can be satisfied: 0 < (R9-R16) / (R9+R16) < 0.50. Therefore, it is advantageous to effectively balance the radius of curvature of the object-side surface of the fifth lens element and the radius of curvature of the image-side surface of the eighth lens element so that the fifth and eighth lens elements can work together to improve image quality in the central image area. Furthermore, the following condition can also be satisfied: 0.05 < (R9-R16) / (R9+R16) < 0.45.

[0036] If the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is TD, and the axial distance between the image-side surface of the eighth lens element and the image surface, measured at the reference wavelength of the d-line, is BLd, then the following condition can be satisfied: 8.00 < TD / BLd < 18.00. Therefore, it is advantageous to balance the lens sizes and the back focal length to achieve a suitable balance between the illuminance at the edge and the lens size. Furthermore, the following condition can also be satisfied: 9.00 < TD / BLd < 16.00.

[0037] 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 met: 0.20 < T12 / T23 < 1.80. Therefore, it is advantageous to equalize the lens distances between the first and second lens elements, as well as between the second and third lens elements, to provide sufficient space at the object end for adjusting the propagation direction of the beam path and thus increasing design flexibility. Furthermore, the following condition can also be met: 0.30 < T12 / T23 < 1.50.

[0038] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, and the central thickness of the eighth lens element is CT8, the following condition can be met: 0.50 < fd / CT8 < 2.00. Therefore, it is advantageous to achieve a reasonable balance between assembly tolerance and the manufacturability of the eighth lens element. Furthermore, the following condition can also be met: 1.00 < fd / CT8 < 1.80.

[0039] If the f-number of the optical lens assembly used for photography, measured at the reference wavelength of the d-line, is Fnod, the following condition can be met: 1.50 < Fnod < 2.00. Therefore, it is advantageous to achieve a reasonable balance between illuminance and depth of field and to increase the amount of light entering the camera to improve image quality. Furthermore, the following conditions can also be met: 1.60 < Fnod < 1.90. Additionally, the following condition can also be met: 1.70 < Fnod < 1.80.

[0040] If half of the maximum field of view of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is HFOVd, the following condition can be met: 65.0 degrees < HFOVd < 90.0 degrees. Therefore, it is advantageous to have a sufficient imaging area to meet the viewing angle requirements of the devices used. Furthermore, the following condition can also be met: 70.0 degrees < HFOVd < 85.0 degrees.

[0041] If a displacement parallel to an optical axis from an axial vertex on the object-side surface of the second lens element to a position of the maximum effective radius on the object-side surface of the second lens element, measured at the reference wavelength of the d-line, is Sag2R1d, and a central thickness of the second lens element is CT2, the following condition can be satisfied: 0.50 < Sag2R1d / CT2 < 2.50. Therefore, it is advantageous to compensate for the curvature of the lens shape at the edge of the object-side surface of the second lens element in such a way as to eliminate the light deflection angle, thus preventing total internal reflection. Furthermore, the following condition can also be satisfied: 0.80 < Sag2R1d / CT2 < 2.00. See [reference]. Fig.Figure 29 shows a schematic view of Sag2R1d 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 assembly 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 assembly for photography, the value of the displacement is negative.

[0042] If the maximum effective radius of the object-side surface of the first lens element, measured at the reference wavelength of the d-line, is Y1R1d, and the maximum image height of the optical lens assembly for photography is ImgH, the following condition can be met: 1.50 < Y1R1d / ImgH < 2.50. Therefore, it is advantageous to balance the effective radius of the object-side surface of the first lens element and the image height by adjusting the direction of light propagation, thereby reducing the angle of incidence on the image surface, increasing the illuminance at the peripheral field of view, and enlarging the image area. Furthermore, the following condition can also be met: 1.70 < Y1R1d / ImgH < 2.30. See [reference]. Fig. 29, which shows a schematic view of Y1R1d according to the 1st embodiment of the present disclosure.

[0043] If the maximum effective radius of the object-side surface of the first lens element, measured at the reference wavelength of the d-line, is Y1R1d, and the maximum effective radius of the object-side surface of the fifth lens element, measured at the reference wavelength of the d-line, is Y5R1d, the following condition can be satisfied: 3.00 < Y1R1d / Y5R1d < 5.00. Therefore, it is advantageous to match the optical effective radii of the first and fifth lens elements to balance the propagation direction of light at the image end and reduce the angle of incidence on the image surface, thereby increasing the field of view and simultaneously increasing the illuminance. Furthermore, the following condition can also be satisfied: 3.20 < Y1R1d / Y5R1d < 4.80. See [reference]. Fig. 29, which shows a schematic view of Y1R1d and Y5R1d according to the 1st embodiment of the present disclosure.

[0044] If the radius of curvature of the object-side surface of the third lens element is R5 and the radius of curvature of the image-side surface of the third lens element is R6, the following condition can be satisfied: 0.20 < (R5+R6) / (R5-R6) < 2.00. Therefore, it is advantageous to match the radius of curvature of the object-side surface of the third lens element and the radius of curvature of the image-side surface of the third lens element to focus the light and simultaneously increase the image area. Furthermore, the following condition can also be satisfied: 0.35 < (R5+R6) / (R5-R6) < 1.70.

[0045] If the radius of curvature of the object-side surface of the sixth lens element is R11 and the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the following condition can be satisfied: 1.80 < |R11 / fd| < 5.00. Therefore, it is advantageous to effectively compensate for the refractive power and shape of the lens element, thereby correcting aberrations of the optical lens assembly for photography and reducing stray light in the optical lens. Furthermore, the following condition can also be satisfied: 2.00 < |R11 / fd| < 4.50.

[0046] If the central thickness of the first lens element is CT1 and the axial distance between the second and third lens elements is T23, the following condition can be met: 0.10 < CT1 / T23 < 1.00. Therefore, it is advantageous to balance the central thickness of the first lens element and the lens distance between the second and third lens elements, thereby improving the space utilization rate and reducing manufacturing tolerances. Furthermore, the following condition can also be met: 0.30 < CT1 / T23 < 0.75.

[0047] 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: 1.40 < V2 / V3 < 4.00. Therefore, a suitable material configuration of the second and third lens elements is advantageous to compensate for the focusing of light with different wavelengths, especially when used with infrared wavelengths. Furthermore, the following conditions can also be met: 2.00 < V2 / V3 < 3.50. Additionally, the following condition can also be met: 2.60 < V2 / V3 < 3.20.

[0048] If the refractive index of the eighth lens element, measured at the reference wavelength of the d-line, is N8d, the following condition can be met: 1.500 < N8d < 1.600. Therefore, it is advantageous to effectively collect the focusing positions of light with different wavelengths, especially when used with infrared wavelengths, to prevent overlapping images. Furthermore, the following condition can also be met: 1.530 < N8d < 1.580.

[0049] If the radius of curvature of the image-side surface of the sixth lens element is R12, the radius of curvature of the object-side surface of the seventh lens element is R13, and the axial distance between the sixth and seventh lens elements is T67, the following condition can be satisfied: 0.01 < |R12-R13| / T67 < 10.00. Therefore, it is advantageous to adjust the difference between the radius of curvature of the image-side surface of the sixth lens element and the radius of curvature of the object-side surface of the seventh lens element, as well as the lens spacing along the optical axis between the two lens surfaces, thereby correcting spherical aberration and astigmatism in the center. Furthermore, the following condition can also be satisfied: 0.10 < |R12-R13| / T67 < 7.30.

[0050] According to the present disclosure, the above-mentioned features and conditions can be used in numerous combinations to achieve corresponding effects.

[0051] According to the present disclosure, the lens elements of the optical lens assembly 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 assembly 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 assembly for photography. Additionally, the aspherical surfaces can be manufactured by plastic injection molding or glass forming.

[0052] 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.

[0053] 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 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 used to manufacture a lens element from the mixed material by injection molding. Furthermore, the additive can be applied to the lens surfaces to achieve the aforementioned effects.

[0054] According to the present disclosure, each of an object-side surface and an image-side surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface in which 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, this means that for a lens element with a convex surface, the surface is convex in the paraxial region, and for a lens element with a concave surface, the surface is concave in the paraxial region. Furthermore, 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 lies within its paraxial region.

[0055] 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.

[0056] According to the present disclosure, the image surface of the optical lens assembly 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 assembly for photography.

[0057] According to the present disclosure, an image correction unit, such as a field flattener, can optionally be arranged between the lens element that is closest to the image side along the beam path of the optical lens assembly 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 of spherical, aspherical, diffractive, or Fresnel type), 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.

[0058] According to the present disclosure, at least one light deflection element, such as a prism or a mirror, which may be planar, spherical, aspherical, or freeform, can optionally be arranged between an imaged object and the image surface on the imaging beam path, so that the optical lens assembly for photography can be more flexible in its spatial arrangement and therefore the dimensions of an electronic device are not limited by the total path length of the optical lens assembly for photography. See in particular Fig. 31 and Fig. 32. Fig. Figure 31 shows a schematic view of a configuration of a light deflection element in an optical lens assembly for photography according to an embodiment of the present disclosure, and Fig.Figure 32 shows a schematic view of another configuration of a light deflection element in an optical lens assembly for photography according to an embodiment of the present disclosure. Fig. 31 and Fig. 32 The optical lens assembly 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 assembly for photography, as shown in Fig. 31 shown, or arranged between a lens group LG of the optical lens assembly for photography and the image surface IMG, as shown in Fig. 32 shown. See further Fig.33, which shows a schematic view of a configuration of two light deflection elements in an optical lens assembly for photography according to an embodiment of the present disclosure. Fig.33 The optical lens assembly for photography can have, in the sequence from an imaged object (not shown in the figure) to an image surface IMG along a beam path, a first optical axis OA1, a first light deflecting element LF1, a second optical axis OA2, a second light deflecting element LF2, and a third optical axis OA3. The first light deflecting element LF1 is arranged between the imaged object and a lens group LG of the optical lens assembly for photography, the second light deflecting element LF2 is arranged between the lens group LG of the optical lens assembly for photography and the image surface IMG, and the direction of propagation of the light on the first optical axis OA1 can be the same direction as the direction of propagation of the light on the third optical axis OA3, as shown in Fig.Figure 33 shows that the optical lens assembly for photography can optionally be provided with three or more light deflection elements, and the present disclosure is not limited to the type, number and position of the light deflection elements of the embodiments disclosed in the aforementioned figures.

[0059] According to the present disclosure, the optical lens assembly for photography can comprise at least one aperture, for example an aperture diaphragm, a glare diaphragm, or a field diaphragm. The glare diaphragm or field diaphragm is adjusted to eliminate stray light and thereby improve image quality.

[0060] According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or a middle diaphragm. A front diaphragm, arranged between an imaged object and the first lens element, can provide a greater distance between the exit pupil of the optical lens assembly for photography and the image surface to create a telecentric effect, thereby improving the image sensor efficiency of an image sensor (for example, CCD or CMOS). A middle diaphragm, arranged between the first lens element and the image surface, is advantageous for increasing the viewing angle of the optical lens assembly for photography and thereby providing a wider field of view for it.

[0061] According to the present disclosure, the optical lens assembly 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 an aperture assembly 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.

[0062] According to the present disclosure, the optical lens assembly for photography can comprise one or more optical elements for limiting the shape of the light passing through the optical lens assembly 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 assembly for photography, or between two adjacent lens elements, to transmit light in a specific shape and thus meet the application requirements.

[0063] According to the present disclosure, the optical lens assembly 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, a prism, a mirror, etc.The support can be a base for holding 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.

[0064] According to the present disclosure, the optical lens assembly 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 to adapt the shape to non-circular lens elements or aperture diaphragms in order to save space and to fully utilize the light passing through the non-circular lens elements or aperture diaphragms, thereby reducing stray light. Furthermore, the light-blocking element can be provided with a wavy or serrated structure at the edge of an inner aperture region.

[0065] 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 light deflection element, the axial optical data are also calculated along the deflected optical axis.

[0066] In accordance with the above description of the present disclosure, the following specific embodiments are provided for further explanation. 1. Design

[0067] Fig. Figure 1 is a schematic representation 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 assembly for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0068] The first lens element E1 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 first lens element E1 is made of glass and both its object-side and image-side surfaces are spherical.

[0069] 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 image-side surface of the second lens element E2 has an inflection point.

[0070] 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 an inflection point. The object-side surface of the third lens element E3 has a critical point in an off-axis region.

[0071] 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 glass and both its object-side and image-side surfaces are spherical.

[0072] The fifth lens element E5, 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 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 an inflection point. The object-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0073] The sixth lens element E6, 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 sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the sixth lens element E6 has an inflection point.

[0074] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0075] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0076] The E9 filter is made of plastic 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0077] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0078] 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 i can be 4, 6, 8, 10, 12, 14, 16, 18 and 20 in the embodiments, but is not limited to these.

[0079] In the optical lens assembly for photographing the image acquisition unit according to the first embodiment, if a focal length of the optical lens assembly for photography is f, an aperture number of the optical lens assembly for photography is Fno, half of a maximum field of view of the optical lens assembly for photography is HFOV, a focal length of the optical lens assembly for photography measured at a reference wavelength of the d-line is fd, an aperture number of the optical lens assembly for photography measured at the reference wavelength of the d-line is Fnod, and half of a maximum field of view of the optical lens assembly for photography measured at the reference wavelength of the d-line is HFOVd, these parameters have the following values: fd = 2.61 mm, Fnod = 1.75, HFOV = 79.1 degrees.

[0080] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG, measured at the reference wavelength of the d-line, is TLd and the focal length of the optical lens assembly, measured at the reference wavelength of the d-line, is fd, then the following condition is met: TLd / fd = 7.89.

[0081] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG, measured at the reference wavelength of the d-line, is TLd and a maximum image height of the optical lens assembly for photography (which may be half the diagonal length of an effective light-sensitive area of ​​the image sensor) is ImgH, then the following condition is met: TLd / ImgH = 5.62.

[0082] If the axial distance between the object-side surface of the first lens element E1 and the image-side surface of the eighth lens element E8 is TD, and the axial distance between the image-side surface of the eighth lens element E8 and the image surface IMG, measured at the reference wavelength of the d-line, is BLd, then the following condition is met: TD / BLd = 11.22.

[0083] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, then the focal length of the first lens element E1, measured at the reference wavelength of the d-line, is f1d, the focal length of the second lens element E2, measured at the reference wavelength of the d-line, is f2d, the focal length of the third lens element E3, measured at the reference wavelength of the d-line, is f3d, the focal length of the fourth lens element E4, measured at the reference wavelength of the d-line, is f4d, the focal length of the fifth lens element E5, measured at the reference wavelength of the d-line, is f5d, the focal length of the sixth lens element E6, measured at the reference wavelength of the d-line, is f6d, the focal length of the seventh lens element E7, measured at the reference wavelength of the d-line, is f7d, and the focal length of the eighth lens element E8, measured at the reference wavelength of the d-line,If f8d is the focal length of the i-th lens element, measured at the reference wavelength of the d-line, fid, then the following condition is satisfied: Σ|fd / fid| = 2.73, where i = 1, 2, 3, 4, 5, 6, 7, and 8. In this embodiment, the number of lens elements is eight, and therefore Σ|fd / fid| = |fd / f1d| + |fd / f2d| + |fd / f3d| + |fd / f4d| + |fd / f5d| + |fd / f6d| + |fd / f7d| + |fd / f8d|.

[0084] If the focal length of the first lens element E1, measured at the reference wavelength of the d-line, is f1d and a radius of curvature of the object-side surface of the first lens element E1 is R1, then the following condition is satisfied: |f1d / R1| = 0.48.

[0085] If the focal length of the second lens element E2, measured at the reference wavelength of the d-line, is f2d and the focal length of the sixth lens element E6, measured at the reference wavelength of the d-line, is f6d, then the following condition is satisfied: |f2d / f6d| = 2.31.

[0086] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, a radius of curvature of the object-side surface of the eighth lens element E8 is R15, and a radius of curvature of the image-side surface of the eighth lens element E8 is R16, then the following condition is satisfied: |fd / R15|+|fd / R16| = 1.26.

[0087] If the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd and the mean thickness of the eighth lens element E8 is CT8, then the following condition is met: fd / CT8 = 1.45.

[0088] If the radius of curvature of the object-side surface of the sixth lens element E6 is R11 and the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, then the following condition is met: |R11 / fd| = 2.52.

[0089] If the radius of curvature of the object-side surface of the third lens element E3 is R5 and the radius of curvature of the image-side surface of the third lens element E3 is R6, then the following condition is met: (R5+R6) / (R5-R6) = 0.71.

[0090] 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 image-side surface of the eighth lens element E8 is R16, then the following condition is met: (R9-R16) / (R9+R16) = 0.34.

[0091] If the radius of curvature of the object-side surface of the sixth lens element E6 is R11 and the radius of curvature of the image-side surface of the sixth lens element E6 is R12, then the following condition is met: (R11+R12) / (R11-R12) = 0.24.

[0092] If the radius of curvature of the image-side surface of the sixth lens element E6 is R12, the radius of curvature of the object-side surface of the seventh lens element E7 is R13, and the axial distance between the sixth lens element E6 and the seventh lens element E7 is T67, then the following condition is satisfied: |R12-R13| / T67 = 0.38. 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.

[0093] If the central thickness of the first lens element E1 is CT1 and the axial distance between the second lens element E2 and the third lens element E3 is T23, then the following condition is met: CT1 / T23 = 0.57.

[0094] If the central thickness of the first lens element E1 is CT1 and the central thickness of the seventh lens element E7 is CT7, then the following condition is met: CT1 / CT7 = 0.43.

[0095] 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 = 1.00.

[0096] If the axial distance between the second lens element E2 and the third lens element E3 is T23 and a central thickness of the third lens element E3 is CT3, then the following condition is met: T23 / CT3 = 0.98.

[0097] If the refractive index of the eighth lens element E8, measured at the reference wavelength of the d-line, is N8d, then the following condition is met: N8d = 1.544.

[0098] 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 = 2.87.

[0099] If the maximum effective radius of the object-side surface of the first lens element E1, measured at the reference wavelength of the d-line, is Y1R1d, and the maximum effective radius of the object-side surface of the fifth lens element E5, measured at the reference wavelength of the d-line, is Y5R1d, then the following condition is satisfied: Y1R1d / Y5R1d = 3.82.

[0100] If the maximum effective radius of the object-side surface of the first lens element E1, measured at the reference wavelength of the d-line, is Y1R1d and the maximum image height of the optical lens assembly for photography is ImgH, then the following condition is met: Y1R1d / ImgH = 1.85.

[0101] If a displacement parallel to the optical axis from an axial vertex on the object-side surface of the second lens element E2 to a position of the maximum effective radius on the object-side surface of the second lens element E2, measured at the reference wavelength of the d-line, is Sag2R1d, and a central thickness of the second lens element E2 is CT2, then the following condition is satisfied: Sag2R1d / CT2 = 0.84. In this embodiment, the direction of Sag2R1d points towards the image side of the optical lens assembly for photography, and therefore the value of Sag2R1d is positive.

[0102] The detailed optical data of the 1st embodiment are shown in Table 1A to Table 1B and the aspherical surface data are shown in Table 1C below. TABLE 1A 1. Design f = 2.61 mm, Fno = 1.75, HFOV = 78.7 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 17,0787 (SPH) 1,114 Glass 1,816 42,7 -8,31 2 4,7135 (SPH) 1,964 3 Lens 2 17,2895 (ASP) 0,800 plastic 1,535 56,0 -8,61 4 3,5813 (ASP) 1,690 5 Aperture Plano 0,275 6 Lens 3 56,8263 (ASP) 2,000 plastic 1,641 19,5 12,79 7 -9,4486 (ASP) 1,321 8 Aperture Plano 0,366 9 Lens 4 31,3139 (SPH) 1,875 Glass 1,787 46,6 7,77 10 -7,4074 (SPH) 0,118 11 Ape.-Blender Plano -0,068 12 Lens 5 8,0869 (ASP) 1,323 plastic 1,536 56,1 6,23 13 -5,3700 (ASP) 0,040 14 Lens 6 -6,5783 (ASP) 0,600 plastic 1,641 19,5 -3,82 15 4,0470 (ASP) 0,452 16 Lens 7 4,2207 (ASP) 2,600 plastic 1,536 56,1 7,03 17 -27,5827 (ASP) 0,549 18 Lens 8 4,2774 (ASP) 1,800 plastic 1,535 56,0 90,65 19 4,0027 (ASP) 0,500 20 filter Plano 0,210 plastic 1,508 64,2 - 21 Plano 0,966 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2.835 mm. An effective radius of aperture S2 (surface 8) is 1.802 mm. TABLE 1B 1. Design Note: Reference wavelength is 587.6 nm (d-line), fd = 2.61 mm, Fnod = 1.75, HFOVd = 79.1 degrees, TLd = 20.496 mm element index Focal length Lens 1 1,835 -8,13 Lens 2 1,544 -8,48 Lens 3 1,669 12,26 Lens 4 1,804 7,62 Lens 5 1,545 6,13 Lens 6 1,669 -3,66 Lens 7 1,545 6,92 Lens 8 1,544 87,53 filter 1,517 - TABLE 1C Aspheric coefficients Surface # 3 4 6 7 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,4125781E-03 2,3254274E-03 -3,0407523E-03 -2,6680430E-03 A6 = -2,3127132E-04 -3,6758904E-04 -2,3155908E-04 -7,3631203E-05 A8 = 5,9877877E-05 2,2542160E-04 4,8427085E-05 2,0708483E-05 A10 = -7,6554323E-06 -6,9804930E-05 -1,2000075E-05 -5,4581930E-06 A12 = 4,9564700E-07 1,8041578E-05 1,2608606E-06 7,8201119E-07 A14 = -1,6196908E-08 -3,1008477E-06 -7,5461960E-08 -5,4156200E-08 A16 = 2,1531246E-10 2,7954640E-07 2,1716096E-09 1,5316478E-09 A18 = - -1,0144912E-08 - - Surface # 12 13 14 15 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,00000E+00 A4 = -6,2056008E-03 2,0896272E-03 -3,7611656E-03 -2,4109834E-02 A6 = 2,3250887E-03 -1,6084897E-03 6,6030254E-03 1,5411688E-02 A8 = -4,7757660E-03 -9,0488379E-03 -1,3033824E-02 -9,7232735E-03 A10 = 4,6818125E-03 7,7205332E-03 8,4158951E-03 4,1406906E-03 A12 = -2,7251540E-03 -2,7724284E-03 -2,4822521E-03 -1,1458586E-03 A14 = 9,1171656E-04 4,7575274E-04 2,9305485E-04 1,9884293E-04 A16 = -1,6303737E-04 -3,2398302E-05 5,6535571E-06 -2,0243761E-05 A18 = 1,1964652E-05 - -2,8803553E-06 1,0413935E-06 A20 = - - - -1,8080659E-08 Surface # 16 17 18 19 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,7883147E-02 -2,7496442E-02 -3,6806359E-02 -1,6911641E-02 A6 = 6,3993184E-03 8,2540527E-03 4,6991602E-03 -7,4127628E-04 A8 = -2,3309156E-03 -1,8724746E-03 -4,9185195E-04 6,8644782E-04 A10 = 6,2616360E-04 3,6510771E-04 6,2151349E-05 -1,5137602E-04 A12 = -1,1836733E-04 -5,7382471E-05 -1,5219297E-05 1,7941454E-05 A14 = 1,5145579E-05 6,3076568E-06 2,2650679E-06 -1,2803985E-06 A16 = -1,1593135E-06 -3,9031731E-07 -1,5398348E-07 5,1795613E-08 A18 = 3,9226678E-08 1,0057344E-08 3,7716693E-09 -9,1540853E-10

[0103] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). The surface counts 0–22 represent the surfaces arranged sequentially along the optical axis from the object side to the image side. Table 1B lists the refractive index and focal length of each lens element in the optical lens assembly for photography of the first embodiment, measured at the reference wavelength of 587.6 nm (d-line). It should be noted that the optical lens assembly for photography of the first embodiment is suitable for the infrared band application scenario, the visible band application scenario, or the application scenario encompassing both the infrared and visible bands. In Table 1C, k represents the conic coefficient of the equation for the aspherical surface profiles. A4–A20 represent the 4th to 20th order aspherical coefficients.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, Table 1B, and Table 1C of the first embodiment. Therefore, no further explanation is given in this regard. 2. Design

[0104] 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 comprises the image acquisition unit 2, the optical lens assembly for photography (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture diaphragm ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0105] The first lens element E1 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 first lens element E1 is made of glass and both its object-side and image-side surfaces are spherical.

[0106] 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 an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0107] 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 an inflection point. The object-side surface of the third lens element E3 has a critical point in an off-axis region.

[0108] The fourth lens element E4, 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 fourth lens element E4 is made of glass and both its object-side and image-side surfaces are spherical.

[0109] The fifth lens element E5, 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 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 an inflection point.

[0110] The sixth lens element E6, 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 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 an inflection point. The object-side surface of the sixth lens element E6 has a critical point in an off-axis region.

[0111] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0112] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0113] The E9 filter is made of plastic 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0114] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0115] The detailed optical data of the 2nd embodiment are shown in Table 2A to Table 2B and the aspherical surface data are shown in Table 2C below. TABLE 2A 2. Design f = 2.60 mm, Fno = 1.75, HFOV = 79.0 degrees Surface# radius of curvature thickness material index Abbe# Focal length 0 object infinity infinity 1 Lens 1 17,2646 (SPH) 0,996 Glass 1,787 46,6 -8,82 2 4,8274 (SPH) 2,289 3 Lens 2 -11,3426 (ASP) 0,802 plastic 1,553 37,4 -8,93 4 8,9506 (ASP) 1,509 5 Aperture Plano 0,238 6 Lens 3 200,0000 (ASP) 1,287 plastic 1,641 19,5 15,78 7 -10,6345 (ASP) 2,000 8 Ape.-Blender Plano 0,086 9 Lens 4 -24,8700 (SPH) 1,466 Glass 1,772 47,5 12,58 10 -7,1650 (SPH) 0,262 11 Aperture Plano -0,222 12 Lens 5 6,2501 (ASP) 2,082 plastic 1,535 56,0 5,41 13 -4,7710 (ASP) 0,203 14 Lens 6 27,8691 (ASP) 0,701 plastic 1,641 19,5 -4,59 15 2,6380 (ASP) 0,274 16 Lens 7 5,1761 (ASP) 2,500 plastic 1,535 56,0 4,22 17 -3,3395 (ASP) 0,262 18 Lens 8 -19,9042 (ASP) 1,600 plastic 1,593 25,6 -6,72 19 5,1373 (ASP) 0,500 20 filter Plano 0,210 plastic 1,508 64,2 - 21 Plano 0,958 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2,870 mm. An effective radius of aperture S2 (surface 11) is 1,917 mm. TABLE 2B 2. Design Note: Reference wavelength is 587.6 nm (d-line). fd = 2.59 mm, Fnod = 1.75, HFOVd = 79.5 degrees, TLd = 19.998 mm element index Focal length Lens 1 1,804 -8,64 Lens 2 1,566 -8,71 Lens 3 1,669 15,13 Lens 4 1,788 12,32 Lens 5 1,544 5,33 Lens 6 1,669 -4,40 Lens 7 1,544 4,16 Lens 8 1,614 -6,50 filter 1,517 - TABLE 2C Aspheric coefficients Surface # 3 4 6 7 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,5825334E-02 1,8480206E-02 -2,3545495E-03 -1,6397641E-03 A6 = -2,2712505E-03 -1,3942102E-03 6,2839838E-05 1,9510300E-05 A8 = 2,6246931E-04 -5,8770715E-05 -9,7673331E-05 -3,4102028E-05 A10 = -2,2552998E-05 5,5228680E-05 3,0661513E-05 8,9551912E-06 A12 = 1,3118197E-06 -8,2183377E-06 -4,9745374E-06 -9,4540983E-07 A14 = -4,5126305E-08 2,3761882E-07 4,6462891E-07 1,0890776E-08 A16 = 6,7981676E-10 6,5207387E-08 -2,1849422E-08 1,5191151E-09 A18 = - -5,1488140E-09 - - Surface # 12 13 14 15 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,00000E+00 A4 = -1,2457158E-03 -2,5279428E-03 -3,3198399E-02 -3,6335845E-02 A6 = -6,3288237E-04 4,0739021E-03 1,5026745E-02 1,4129968E-02 A8 = 2,6875160E-04 -2,4361799E-03 -5,8802252E-03 -4,7485079E-03 A10 = -2,2280855E-04 6,3427063E-04 1,5604141E-03 1,3379779E-03 A12 = 1,0558999E-04 -9,8597019E-05 -3,1421745E-04 -3,2096502E-04 A14 = -3,3224279E-05 8,9728492E-06 4,8645318E-05 5,9456367E-05 A16 = 5,6123244E-06 -3,8995153E-07 -4,7511588E-06 -7,3828729E-06 A18 = -3,9685350E-07 - 2,0281436E-07 5,3542658E-07 A20 = - - - -1,7330065E-08 Surface # 16 17 18 19 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,6972651E-03 2,3863256E-03 -2,2062792E-02 -2,5827951E-02 A6 = -1,2365735E-03 2,9354357E-03 6,2615722E-03 5,1245392E-03 A8 = 6,7062580E-04 -1,5959475E-03 -2,6498095E-03 -1,2029093E-03 A10 = -1,8317366E-04 4,5976894E-04 7,4054118E-04 2,0780921E-04 A12 = 3,0586965E-05 -7,3934909E-05 -1,2593741E-04 -2,3909353E-05 A14 = -4,3418460E-06 6,8060257E-06 1,2741613E-05 1,7364525E-06 A16 = 5,1848971E-07 -3,3866960E-07 -6,9439487E-07 -7,1692553E-08 A18 = -2,8568440E-08 8,0426950E-09 1,5378050E-08 1,2729237E-09

[0116] 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 the parameters listed in Table 2D are also the same as in the first embodiment, with corresponding values ​​for the second embodiment, so no further explanation is required.

[0117] Furthermore, these parameters from Table 2A, Table 2B and Table 2C can be calculated as the following values ​​and must meet the following conditions: 2D TABLE Schematic parameters fd [mm] 2,59 (R9-R16) / (R9+R16) 0,10 Fnod 1,75 (R11+R12) / (R11-R12) 1,21 HFOVd [Grade] 79,5 |R12-R13| / T67 9,26 TLd / fd 7,73 CT1 / T23 0,57 TLd / ImgH 5,9 CT1 / CT7 0,40 TD / BLd 11,03 T12 / T23 1,31 Σ|fd / fid| 3,07 T23 / CT3 1,36 |f1d / R1| 0,50 N8d 1,614 |f2d / f6d| 1,98 V2 / V3 1,92 |fd / R15|+|fd / R16| 0,63 Y1R1d / Y5R1d 3,39 fd / CT8 1,62 Y1R1d / ImgH 1,80 |R11 / fd| 10,77 Sag2R1d / CT2 0,42 (R5+R6) / (R5-R6) 0,90 - - 3. Design

[0118] Fig. Figure 5 is a schematic representation 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 assembly for photography (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0119] The first lens element E1 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 first lens element E1 is made of glass and both its object-side and image-side surfaces are spherical.

[0120] 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.

[0121] 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 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.

[0122] The fourth lens element E4, 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 fourth lens element E4 is made of glass and both its object-side and image-side surfaces are spherical.

[0123] The fifth lens element E5, 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 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 an inflection point. The image-side surface of the fifth lens element E5 has an inflection point. The object-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0124] The sixth lens element E6, 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 sixth lens element E6 is made of plastic material and has aspheric surfaces on both the object-side and image-side surfaces. The object-side surface of the sixth lens element E6 has an inflection point. The image-side surface of the sixth lens element E6 has an inflection point.

[0125] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0126] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0127] The E9 filter is made of plastic 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0128] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0129] The detailed optical data of the 3rd embodiment are shown in Tables 3A to 3B and the aspherical surface data are shown in Table 3C below. TABLE 3A 3. Design f = 2.59 mm, Fno = 1.75, HFOV = 79.8 degrees Surface# radius of curvature thickness material index Abbe# Focal length 0 object infinity infinity 1 Lens 1 17,1634 (SPH) 1,354 Glass 1,816 42,7 -12,63 2 6,2141 (SPH) 1,235 3 Lens 2 16,1683 (ASP) 0,811 plastic 1,535 56,0 -7,17 4 3,0479 (ASP) 1,555 5 Aperture Plano 0,500 6 Lens 3 -86,4198 (ASP) 2,550 plastic 1,641 19,5 11,32 7 -6,7729 (ASP) -0,174 8 Aperture Plano 0,247 9 Lens 4 -16,4833 (SPH) 3,095 Glass 1,787 46,6 7,74 10 -4,8179 (SPH) 0,053 11 Ape. Aperture Plano -0,003 12 Lens 5 6,5827 (ASP) 1,186 plastic 1,536 56,1 6,99 13 -8,1536 (ASP) 0,040 14 Lens 6 -8,1528 (ASP) 0,700 plastic 1,641 19,5 -3,42 15 3,1050 (ASP) 0,199 16 Lens 7 4,0681 (ASP) 2,675 plastic 1,536 56,1 6,24 17 -14,5739 (ASP) 0,437 18 Lens 8 3,1451 (ASP) 1,600 plastic 1,535 56,0 20,79 19 3,6064 (ASP) 0,700 20 filter Plano 0,210 plastic 1,508 64,2 - 21 Plano 0,974 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2,690 mm. An effective radius of aperture S2 (surface 8) is 2.119 mm. TABLE 3B 3. Design Note: The reference wavelength is 587.6 nm (d-line). fd = 2.58 mm, Fnod = 1.75, HFOVd = 80.0 degrees, TLd = 19.947 mm element index Focal length Lens 1 1,835 -12,36 Lens 2 1,544 -7,06 Lens 3 1,669 10,84 Lens 4 1,804 7,57 Lens 5 1,545 6,88 Lens 6 1,669 -3,28 Lens 7 1,545 6,15 Lens 8 1,544 20,34 filter 1,517 - TABLE 3C Aspheric coefficients Surface # 3 4 6 7 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 3,4602830E-03 3,8962910E-03 -6,8128403E-03 -3,6681837E-03 A6 = -7,5294785E-04 -2,1660881E-03 -4,6498305E-04 2,7345828E-04 A8 = 9,3983317E-05 7,0251177E-04 7,1558790E-05 3,0439467E-05 A10 = -6,6686231 E-06 -2,6823553E-04 -1,7476097E-05 5,1100632E-06 A12 = 2,7968197E-07 6,9738067E-05 2,9963319E-06 -2,7343203E-06 A14 = -6,3815979E-09 -1,0620068E-05 -9,1333950E-08 4,7960881E-07 A16 = 6,3198751E-11 8,4870643E-07 -6,6226905E-09 -2,4828400E-08 A18 = - -2,7944655E-08 - - Surface # 12 13 14 15 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,00000E+00 A4 = -1,2940409E-02 2,0540296E-02 2,2667600E-02 -2,2183379E-02 A6 = 6,4749823E-03 -5,1043994E-02 -4,1025368E-02 8,5661526E-03 A8 = -1,3849841E-02 3,4076066E-02 3,0529899E-02 -9,3676244E-04 A10 = 1,4594774E-02 -1,2398640E-02 -1,3460030E-02 -1,4934155E-03 A12 = -9,1771609E-03 2,6996474E-03 4,2654673E-03 1,1645533E-03 A14 = 3,3615839E-03 -3,5987726E-04 -1,0076150E-03 -4,2389367E-04 A16 = -6,6057515E-04 2,3955576E-05 1,4873136E-04 8,4652576E-05 A18 = 5,3755789E-05 - -9,4741082E-06 -8,8653707E-06 A20 = - - - 3,8072439E-07 Surface # 16 17 18 19 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -2,1297478E-02 -3,3772422E-02 -4,5909364E-02 -1,7299106E-02 A6 = 6,9048833E-03 1,4877917E-02 1,1496550E-02 4,4607086E-04 A8 = -1,4164403E-03 -5,6542982E-03 -3,7975603E-03 4,1770715E-06 A10 = -1,0992330E-04 1,6625889E-03 9,4450207E-04 -2,2699474E-06 A12 = 1,8525333E-04 -3,4269260E-04 -1,6329289E-04 6,5462669E-08 A14 = -5,4844084E-05 4,5079006E-05 1,7698632E-05 -7,1060620E-08 A16 = 7,1355563E-06 -3,3499277E-06 -1,0797819E-06 9,6201785E-09 A18 = -3,5389049E-07 1,0668215E-07 2,7752915E-08 -3,9501606E-10

[0130] 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 the parameters listed in Table 3D are also the same as those for the third embodiment, so no further explanation is required.

[0131] Furthermore, these parameters from Table 3A, Table 3B and Table 3C can be calculated as the following values ​​and must meet the following conditions: 3D TABLE Schematic parameters fd [mm] 2,58 (R9-R16) / (R9+R16) 0,29 Fnod 1,75 (R11+R12) / (R11-R12) 0,45 HFOVd [Grade] 80,0 |R12-R13| / T67 4,84 TLd / fd 7,72 CT1 / T23 0,66 TLd / ImgH 5,47 CT1 / CT7 0,51 TD / BLd 9,57 T12 / T23 0,60 Σ|fd / fid| 2,87 T23 / CT3 0,81 |f1d / R1| 0,72 N8d 1,544 |f2d / f6d| 2,15 V2 / V3 2,87 |fd / R15|+|fd / R16| 1,54 Y1R1d / Y5R1d 4,01 fd / CT8 1,61 Y1R1d / ImgH 1,86 |R11 / fd| 3,16 Sag2R1d / CT2 1,08 (R5+R6) / (R5-R6) 1,17 - - 4. Design

[0132] Fig. Figure 7 is a schematic representation 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 assembly for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture diaphragm ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), wherein no additional lens element is arranged between any of the adjacent eight lens elements.

[0133] The first lens element E1 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 first lens element E1 is made of glass and both its object-side and image-side surfaces are spherical.

[0134] 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 image-side surface of the second lens element E2 has an inflection point.

[0135] 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 plastic material and both its object-side and image-side surfaces are aspherical.

[0136] 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 glass and both its object-side and image-side surfaces are spherical.

[0137] The fifth lens element E5, 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 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 an inflection point. The object-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0138] The sixth lens element E6, 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 sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0139] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0140] 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 aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0141] The E9 filter is made of plastic 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0142] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0143] The detailed optical data of the 4th embodiment are shown in Tables 4A to 4B and the aspherical surface data are shown in Table 4C below. TABLE 4A 4. Design f = 2.59 mm, Fno = 1.75, HFOV = 79.7 degrees Surface # radius of curvature thickness material index Abbe# Focal length 0 object infinity infinity 1 Lens 1 16,9148 (SPH) 0,978 Glass 1,816 42,7 -8,39 2 4,7487 (SPH) 1,521 3 Lens 2 9,2133 (ASP) 0,800 plastic 1,535 56,0 -9,52 4 3,1816 (ASP) 1,943 5 Aperture Plano 0,460 6 Lens 3 -46,2259 (ASP) 2,000 plastic 1,641 19,5 14,28 7 -7,7715 (ASP) 1,184 8 Aperture Plano 0,302 9 Lens 4 20,9624 (SPH) 1,901 Glass 1,787 46,6 7,57 10 -8,0000 (SPH) 0,099 11 Ape.-Blender Plano -0,049 12 Lens 5 9,0367 (ASP) 1,307 plastic 1,536 56,1 6,12 13 -4,8935 (ASP) 0,040 14 Lens 6 -8,2966 (ASP) 0,700 plastic 1,641 19,5 -3,59 15 3,2951 (ASP) 0,283 16 Lens 7 4,7899 (ASP) 2,592 plastic 1,536 56,1 6,09 17 -8,3419 (ASP) 0,389 18 Lens 8 5,1661 (ASP) 1,796 plastic 1,535 56,0 -86,31 19 4,0833 (ASP) 0,550 20 filter Plano 0,210 plastic 1,508 64,2 - 21 Plano 0,988 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2,810 mm. An effective radius of aperture S2 (surface 8) is 1,750 mm. TABLE 4B 4. Design Note: Reference wavelength is 587.6 nm (d-line). fd = 2.58 mm, Fnod = 1.75, HFOVd = 80.0 degrees, TLd = 19.995 mm element index Focal length Lens 1 1.835 -8.21 Lens 2 1.544 -9.37 Lens 3 1,669 13,68 Lens 4 1,804 7,42 Lens 5 1,545 6,02 Lens 6 1,669 -3,44 Lens 7 1,545 6,00 Lens 8 1,544 -86,17 filter 1,517 - TABLE 4C Aspheric coefficients Surface # 3 4 6 7 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 2,6428691E-03 3,4772152E-03 -3,3200231E-03 -2,0967989E-03 A6 = -1,9197712E-04 -2,5842480E-04 6,5013544E-05 -1,6560726E-04 A8 = -1,6882355E-05 5,8850157E-05 -1,5095302E-04 4,8693367E-05 A10 = 4,7010838E-06 -4,0782020E-05 4,5088435E-05 -1,2781826E-05 A12 = -3,7700944E-07 9,4581716E-06 -7,4714452E-06 1,8181097E-06 A14 = 1,2975621E-08 -8,5248644E-07 5,5480065E-07 -1,2427296E-07 A16 = -1,5492011E-10 2,0302427E-08 -1,3543944E-08 3,4910806E-09 A18 = - -1,2257342E-10 - - Surface # 12 13 14 15 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,00000E+00 A4 = -5,8332763E-03 7,5253834E-03 -7,0367144E-03 -3,0373633E-02 A6 = 5,0656190E-03 -1,2601471E-02 8,9079684E-05 1,9459401E-02 A8 = -9,8983006E-03 4,1429878E-03 -3,3977525E-03 -1,1040138E-02 A10 = 9,7105338E-03 -2,3105491E-04 2,7745660E-03 4,5928783E-03 A12 = -5,6567058E-03 -2,3026080E-04 -8,9252703E-04 -1,3692018E-03 A14 = 1,9080687E-03 6,0123893E-05 1,1801255E-04 2,8533781E-04 A16 = -3,4613893E-04 -4,7941113E-06 -2,8580271E-07 -3,9550725E-05 A18 = 2,6025253E-05 - -9,1334818E-07 3,2770777E-06 A20 = - - - -1,2252853E-07 Surface # 16 17 18 19 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,9597733E-02 -3,5711423E-02 -4,6614948E-02 -1,8939605E-02 A6 = 9,1720905E-03 1,3982342E-02 1,1027066E-02 8,7294825E-04 A8 = -3,6644223E-03 -3,9805384E-03 -2,0809450E-03 1,9399266E-04 A10 = 1,1198334E-03 8,7761373E-04 2,7786462E-04 -7,4885838E-05 A12 = -2,6093988E-04 -1,3914783E-04 -2,3360458E-05 1,1646086E-05 A14 = 4,2079296E-05 1,4565589E-05 7,3043155E-07 -1,0268217E-06 A16 = -4,0629593E-06 -9,0606682E-07 3,4560324E-08 4,8807653E-08 A18 = 1,7527919E-07 2,6007708E-08 -2,2978739E-09 -9,6735505E-10

[0144] 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 the parameters listed in Table 4D are also the same as in the first embodiment, with corresponding values ​​for the fourth embodiment, so no further explanation is given here.

[0145] Furthermore, these parameters from Table 4A, Table 4B and Table 4C can be calculated as the following values ​​and must meet the following conditions: 4D TABLE Schematic parameters fd [mm] 2,58 (R9-R16) / (R9+R16) 0,38 Fnod 1,75 (R11+R12) / (R11-R12) 0,43 HFOVd [Grade] 80,0 |R12-R13| / T67 5,28 TLd / fd 7,74 CT1 / T23 0,41 TLd / ImgH 5,49 CT1 / CT7 0,38 TD / BLd 10,43 T12 / T23 0,63 Σ|fd / fid| 2,77 T23 / CT3 1,20 |f1d / R1| 0,49 N8d 1,544 |f2d / f6d| 2,72 V2 / V3 2,87 |fd / R15|+|fd / R16| 1,13 Y1R1d / Y5R1d 3,82 fd / CT8 1,44 Y1R1d / ImgH 1,83 |R11 / fd| 3,21 Sag2R1d / CT2 1,41 (R5+R6) / (R5-R6) 1,40 - - 5. Design

[0146] 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 assembly for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture diaphragm ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0147] The first lens element E1 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 first lens element E1 is made of glass and both its object-side and image-side surfaces are spherical.

[0148] 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. The image-side surface of the second lens element E2 has an inflection point.

[0149] The third lens element E3, 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 third lens element E3 is made of plastic material and has aspheric object-side and image-side surfaces. The image-side surface of the third lens element E3 has two inflection points. The image-side surface of the third lens element E3 has two critical points in an off-axis region.

[0150] 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 glass and both its object-side and image-side surfaces are aspherical.

[0151] The fifth lens element E5, 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 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 an inflection point. The image-side surface of the fifth lens element E5 also has an inflection point.

[0152] The sixth lens element E6, 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 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 an inflection point.

[0153] 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 image-side surface of the seventh lens element E7 has two inflection points. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region.

[0154] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0155] 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0156] The detailed optical data of the 5th embodiment are shown in Tables 5A to 5B and the aspherical surface data are shown in Table 5C below. TABLE 5A 5. Design f = 2.24 mm, Fno = 1.75, HFOV = 78.2 degrees Surface# radius of curvature thickness material index Abbe# Focal length 0 object infinity infinity 1 Lens 1 17,1637 (SPH) 0,982 Glass 1,716 54,7 -9,49 2 4,7520 (SPH) 1,136 3 Lens 2 12,8898 (ASP) 0,800 plastic 1,535 56,0 -7,93 4 3,1247 (ASP) 2,100 5 Aperture Plano 0,711 6 Lens 3 -6,9832 (ASP) 1,946 plastic 1,553 37,4 -11,37 7 69,1966 (ASP) 0,358 8 Aperture Plano -0,308 9 Lens 4 6,8116 (ASP) 1,854 Glass 1,887 35,2 5,28 10 -13,0460 (ASP) 1,245 11 Ape.-Blender Plano -0,099 12 Lens 5 7,8762 (ASP) 2,425 plastic 1,535 56,0 5,08 13 -3,7057 (ASP) 0,040 14 Lens 6 -6,8026 (ASP) 0,772 plastic 1,641 19,5 -3,88 15 4,1046 (ASP) 0,062 16 Lens 7 3,6698 (ASP) 2,046 plastic 1,535 56,0 7,35 17 43,8018 (ASP) 0,529 18 Lens 8 3,1453 (ASP) 1,778 plastic 1,535 56,0 10,36 19 5,8345 (ASP) 0,700 20 filter Plano 0,210 Glass 1,508 64,2 - 21 Plano 0,779 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2.766 mm. An effective radius of aperture S2 (surface 8) is 2.278 mm. TABLE 5B 5. Design Note: Reference wavelength is 587.6 nm (d-line). fd = 2.24 mm, Fnod = 1.75, HFOVd = 78.4 degrees, TLd = 20.065 mm element index Focal length Lens 1 1,729 -9,32 Lens 2 1,544 -7,81 Lens 3 1,566 -11,10 Lens 4 1,911 5,14 Lens 5 1,544 5,00 Lens 6 1,669 -3,72 Lens 7 1,544 7,23 Lens 8 1,544 10,17 filter 1,517 - TABLE 5C Aspheric coefficients Surface # 3 4 6 7 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,8276473E-02 1,9978746E-02 -5,4160059E-03 -2,0891467E-02 A6 = -3,7337655E-03 -2,4742974E-03 -4,5202036E-04 6,3968577E-03 A8 = 4,9165991E-04 -1,3612903E-03 3,6191952E-04 -1,3125837E-03 A10 = -4,2775543E-05 6,8862077E-04 -5,8897202E-05 2,2991680E-04 A12 = 2,4551595E-06 -1,5603625E-04 4,5766361E-06 -3,0434710E-05 A14 = -8,2778914E-08 1,9916885E-05 -1,5585847E-07 2,8322313E-06 A16 = 1,2006387E-09 -1,3520714E-06 8,4345759E-10 -1,2105777E-07 A18 = - 3,6478303E-08 - - Surface # 9 10 12 13 k = -9,28708E+00 -1,30558E+01 0,00000E+00 0,00000E+00 A4 = -5,1048759E-03 3,5701150E-03 8,0336672E-04 1,2490887E-02 A6 = 2,8398749E-03 -1,0738459E-03 4,5746472E-03 -2,5890970E-02 A8 = -6,4649302E-04 8,2295694E-05 -1,2165497E-02 2,0013714E-02 A10 = 7,8813943E-05 1,3975918E-06 1,4183194E-02 -9,2310447E-03 A12 = -3,7407822E-06 -4,4776060E-07 -9,6955777E-03 2,4511384E-03 A14 = - - 3,8399468E-03 -3,4790545E-04 A16 = - - -8,1709983E-04 2,0631441E-05 A18 = - - 7,2147882E-05 - Surface # 14 15 16 17 k = 0,00000E+00 -1,00000E+00 0,00000E+00 0,00000E+00 A4 = 1,4627229E-03 -2,3954693E-02 -2,8926637E-02 -2,7310197E-02 A6 = -2,2827308E-02 1,0546309E-02 1,3946362E-02 6,1877292E-03 A8 = 1,9407125E-02 -3,0701546E-03 -6,0085638E-03 -1,0815758E-03 A10 = -9,6804667E-03 2,8549934E-04 1,7361056E-03 8,1874056E-05 A12 = 2,9192421E-03 1,6795394E-04 -3,2049359E-04 4,0743686E-07 A14 = -5,3464463E-04 -7,7473652E-05 3,5571265E-05 1,7910097E-07 A16 = 5,6022434E-05 1,4492070E-05 -2,1325896E-06 -1,0166486E-07 A18 = -2,5606214E-06 -1,3057371E-06 5,2345472E-08 6,3994101E-09 A20 = - 4,6216816E-08 - - Surface # 18 19 k = 0,00000E+00 0,00000E+00 A4 = -2,8150667E-02 5,4872042E-03 A6 = 2,8404225E-03 -5,9675594E-03 A8 = -7,2379990E-04 1,5022074E-03 A10 = 1,9953599E-04 -2,2531153E-04 A12 = -4,6414655E-05 2,0858502E-05 A14 = 6,2001326E-06 -1,1505456E-06 A16 = -4,2632373E-07 3,2843971E-08 A18 = 1,1423917E-08 -3,3182557E-10

[0157] 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 the parameters listed in Table 5D are also the same as in the 1st embodiment, with corresponding values ​​for the 5th embodiment, so no further explanation is given here.

[0158] Furthermore, these parameters from Table 5A, Table 5B and Table 5C can be calculated as the following values ​​and must meet the following conditions: TABLE 5D Schematic parameters fd [mm] 2,24 (R9-R16) / (R9+R16) 0,15 Fnod 1,75 (R11+R12) / (R11-R12) 0,25 HFOVd [Grade] 78,4 |R12-R13| / T67 7,01 TLd / fd 8,97 CT1 / T23 0,35 TLd / ImgH 5,51 CT1 / CT7 0,48 TD / BLd 10,88 T12 / T23 0,40 Σ|fd / fid| 2,74 T23 / CT3 1,44 |f1d / R1| 0,54 N8d 1,544 |f2d / f6d| 2,10 V2 / V3 1,50 |fd / R15|+|fd / R16| 1,09 Y1R1d / Y5R1d 4,15 fd / CT8 1,26 Y1R1d / ImgH 1,86 |R11 / fd| 3,04 Sag2R1d / CT2 1,90 (R5+R6) / (R5-R6) -0,82 - - 6. Design

[0159] 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 sixth embodiment. Fig. 11 The image acquisition unit 6 comprises the optical lens assembly for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture diaphragm ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0160] 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 two inflection points. The image-side surface of the first lens element E1 has one inflection point. The object-side surface of the first lens element E1 has a critical point in an off-axis region.

[0161] 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 image-side surface of the second lens element E2 has one inflection point.

[0162] 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 an inflection point. The object-side surface of the third lens element E3 has a critical point in an off-axis region.

[0163] The fourth lens element E4, 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 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.

[0164] The fifth lens element E5, 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 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 an inflection point.

[0165] The sixth lens element E6, 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 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 an inflection point.

[0166] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0167] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and has both 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 two inflection points. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0168] 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0169] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0170] The detailed optical data of the 6th embodiment are shown in Tables 6A to 6B and the aspherical surface data are shown in Table 6C below. TABLE 6A 6. Design f = 2.11 mm, Fno = 1.75, HFOV = 72.5 degrees Surface# radius of curvature thickness material index Abbe# Focal length 0 object infinity infinity 1 Lens 1 -17,0837 (ASP) 0,711 plastic 1,535 56,0 -7,41 2 5,2388 (ASP) 1,263 3 Lens 2 30,3093 (ASP) 0,898 plastic 1,535 56,0 -9,86 4 4,4493 (ASP) 1,787 5 Aperture Plano 0,186 6 Lens 3 82,7641 (ASP) 1,550 plastic 1,657 18,4 16,30 7 -12,2051 (ASP) 0,198 8 Aperture Plano 0,311 9 Lens 4 -11,6291 (ASP) 2,694 plastic 1,535 56,0 10,01 10 -3,9647 (ASP) 0,132 11 Ape.-Blender Plano -0,029 12 Lens 5 7,4769 (ASP) 1,747 plastic 1,535 56,0 5,18 13 -4,0420 (ASP) 0,040 14 Lens 6 -7,8630 (ASP) 0,700 plastic 1,634 20,4 -4,44 15 4,5319 (ASP) 0,682 16 Lens 7 4,5172 (ASP) 1,650 plastic 1,535 56,0 7,93 17 -61,4976 (ASP) 0,981 18 Lens 8 3,3360 (ASP) 1,620 plastic 1,535 56,0 14,98 19 4,7455 (ASP) 0,800 20 filter Plano 0,210 Glass 1,508 64,2 - 21 Plano 0,372 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2.586 mm. An effective radius of aperture S2 (surface 8) is 2.081 mm. TABLE 6B 6. Design Note: Reference wavelength is 587.6 nm (d-line). fd = 2.09 mm, Fnod = 1.75, HFOVd = 72.8 degrees, TLd = 18,498 mm element index Focal length Lens 1 1,544 -7,29 Lens 2 1,544 -9,70 Lens 3 1,686 15,61 Lens 4 1,544 9,84 Lens 5 1,544 5,09 Lens 6 1,660 -4,26 Lens 7 1,544 7,80 Lens 8 1,544 14,69 filter 1,517 - TABLE 6C Aspheric coefficients Surface # 1 2 3 4 k = -9,90000E+01 -5,40636E-01 0,00000E+00 0,00000E+00 A4 = 1,9997604E-03 -9,8622412E-03 3,3274698E-03 3,2312418E-02 A6 = -3,9773432E-05 1,3075572E-03 -1,6176647E-04 -4,7068804E-03 A8 = -1,1435818E-06 -9,6637372E-05 -5,2917257E-05 2,8583194E-03 A10 = 6,7628798E-08 3,4710635E-06 7,7882218E-06 -1,6895032E-03 A12 = -7,9915224E-10 -3,9321811E-08 -4,5601679E-07 5,8235823E-04 A14 = -5,0148910E-12 -6,3018466E-10 1,3329943E-08 -1,2289119E-04 A16 = 1,0095957E-13 1,2998942E-11 -1,7916522E-10 1,5560892E-05 A18 = - - 7,1199520E-13 -1,0720504E-06 A20 = - - - 3,0495765E-08 Surface # 6 7 9 10 k = 0,00000E+00 0,00000E+00 1,99455E+01 -5,59634E-01 A4 = 7,0355558E-03 3,8227484E-03 3,2055694E-04 -8,1645153E-03 A6 = -2,8194978E-03 -1,9456627E-03 -8,0756085E-04 9,1201365E-03 A8 = 7,2810709E-04 1,4700604E-04 2,2164228E-04 -4,8410264E-03 A10 = -2,2580380E-04 9,1986535E-06 1,1074813E-05 1,6604726E-03 A12 = 4,0753253E-05 -2,5280285E-06 1,3598958E-06 -3,1178518E-04 A14 = -4,0755833E-06 4,3692664E-07 -3,2435440E-07 2,4541053E-05 A16 = 1,7471257E-07 -2,9975665E-08 - - Surface # 12 13 14 15 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,00000E+00 A4 = -1,2225159E-02 -5,2546705E-04 -1,4664973E-02 -2,9674177E-02 A6 = 9,8490022E-03 -1,2939440E-02 1,2774869E-03 1,8402327E-02 A8 = -6,5627967E-03 8,0814343E-03 -2,1632435E-03 -1,1412998E-02 A10 = 2,7803371E-03 -2,4161074E-03 2,8750845E-03 5,6269340E-03 A12 = -8,8791123E-04 2,2548148E-04 -1,4091967E-03 -1,9602106E-03 A14 = 2,4539769E-04 2,9625962E-05 2,8633788E-04 4,6829070E-04 A16 = -6,0870897E-05 -5,1975432E-06 -1,4894950E-05 -7,4895531E-05 A18 = 7,5113266E-06 - -1,1811884E-06 7,4369476E-06 A20 = - - - -3,4814331E-07 Surface # 16 17 18 19 k = 0,00000E+00 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,8925323E-02 -2,1818059E-02 -2,8763216E-02 6,6653924E-04 A6 = 6,6837423E-03 5,4696606E-03 4,5468768E-04 -8,7501501E-03 A8 = -2,2602696E-03 -5,5416876E-04 2,3906343E-04 3,4878423E-03 A10 = 4,7188091E-04 -1,9259373E-04 1,2132962E-05 -8,0515363E-04 A12 = -5,4576118E-05 7,7661311E-05 -3,3179287E-05 1,1559560E-04 A14 = 2,4754174E-06 -1,2135960E-05 7,4615588E-06 -1,0435610E-05 A16 = 1,1649415E-07 9,5606151E-07 -7,1743038E-07 5,7577244E-07 A18 = -1,2278125E-08 -3,0759693E-08 3,2251755E-08 -1,7817561E-08 A20 = - - -5,5648803E-10 2,3906414E-10

[0171] 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 the parameters listed in Table 6D are also the same as in the 1st embodiment, with corresponding values ​​for the 6th embodiment, so no further explanation is given here.

[0172] Furthermore, these parameters from Table 6A, Table 6B and Table 6C can be calculated as the following values ​​and must meet the following conditions: TABLE 6D Schematic parameters fd [mm] 2,09 (R9-R16) / (R9+R16) 0,22 Fnod 1,75 (R11+R12) / (R11-R12) 0,27 HFOVd [Grade] 72,8 |R12-R13| / T67 0,02 TLd / fd 8,84 CT1 / T23 0,36 TLd / ImgH 5,00 CT1 / CT7 0,43 TD / BLd 12,43 T12 / T23 0,64 Σ|fd / fid| 2,16 T23 / CT3 1,27 |f1d / R1| 0,43 N8d 1,544 |f2d / f6d| 2,28 V2 / V3 3,04 |fd / R15|+|fd / R16| 1,07 Y1R1d / Y5R1d 4,33 fd / CT8 1,29 Y1R1d / ImgH 1,85 |R11 / fd| 3,76 Sag2R1d / CT2 0,69 (R5+R6) / (R5-R6) 0,74 - - 7. Design

[0173] 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 assembly for photography (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical lens assembly for photography comprises, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, an aperture diaphragm ST, 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 assembly for photography comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element arranged between any of the adjacent eight lens elements.

[0174] The first lens element E1 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 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 an inflection point. The image-side surface of the first lens element E1 has an inflection point.

[0175] 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 image-side surface of the second lens element E2 has an inflection point.

[0176] 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 an inflection point. The object-side surface of the third lens element E3 has a critical point in an off-axis region.

[0177] The fourth lens element E4, 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 fourth lens element E4 is made of glass 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.

[0178] The fifth lens element E5, 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 fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0179] The sixth lens element E6, 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 sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0180] 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 also convex 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 image-side surface of the seventh lens element E7 has an inflection point.

[0181] The eighth lens element E8, 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 eighth lens element E8 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region.

[0182] The E9 filter is made of plastic 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 assembly used for photography. The IS image sensor is located on or near the image surface IMG of the optical lens assembly used for photography.

[0183] From the first lens element E1 to the eighth lens element E8, there is a lens element that serves as a positive lens element with an Abbe number of less than 30.0, namely the third lens element E3.

[0184] The detailed optical data of the 7th embodiment are shown in Tables 7A to 7B and the aspherical surface data are shown in Table 7C below. TABLE 7A 7. Design f = 2.29 mm, Fno = 1.75, HFOV = 74.7 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Lens 1 12,8842 (ASP) 1,663 Glass 1,742 47,7 -8,58 2 4,0273 (ASP) 2,666 3 Lens 2 14,6407 (ASP) 0,806 plastic 1,535 56,0 -8,56 4 3,4219 (ASP) 1,921 5 Aperture Plano 0,179 6 Lens 3 27,7979 (ASP) 2,000 plastic 1,641 19,5 12,63 7 -11,1041 (ASP) 1,204 8 Aperture Plano 0,139 9 Lens 4 -22,6938 (ASP) 2,000 Glass 1,758 49,5 8,66 10 -5,2815 (ASP) 0,093 11 Ape. Aperture Plano -0,043 12 Lens 5 8,5101 (ASP) 1,554 plastic 1,535 56,0 5,21 13 -3,8799 (ASP) 0,040 14 Lens 6 -5,0312 (ASP) 0,810 plastic 1,625 21,8 -3,39 15 3,8907 (ASP) 0,260 16 Lens 7 4,0683 (ASP) 3,000 plastic 1,535 56,0 3,08 17 -2,0537 (ASP) 0,200 18 Lens 8 -3,9404 (ASP) 2,000 plastic 1,540 44,8 -4,06 19 5,8183 (ASP) 0,500 20 filter Plano 0,210 plastic 1,508 64,2 - 21 Plano 0,656 22 Picture Plano - Note: Reference wavelength is 940.0 nm. An effective radius of aperture S1 (surface 5) is 2,900 mm. An effective radius of aperture S2 (surface 8) is 1.751 mm. TABLE 7B 7. Design Note: Reference wavelength is 587.6 nm (d-line). fd = 2.29 mm, Fnod = 1.75, HFOVd = 75.0 degrees, TLd = 21.860 mm element index Focal length Lens 1 1,757 -8,42 Lens 2 1,544 -8,42 Lens 3 1,669 12,11 Lens 4 1,773 8,48 Lens 5 1,544 5,12 Lens 6 1,650 -3,26 Lens 7 1,544 3,03 Lens 8 1,551 -3,98 filter 1,517 - TABLE 7C Aspheric coefficients Surface # 1 2 3 4 k = 5,57696E-02 -2,09811E-01 5,54113E+00 1,14708E-01 A4 = 3,1709445E-04 2,1401903E-04 3,9565800E-03 6,7812525E-03 A6 = 1,8778628E-05 1,4139661E-04 -1,0589445E-03 -1,6463753E-03 A8 = -1,8777160E-06 -2,2915554E-05 2,2172099E-04 2,4966373E-04 A10 = 6,0518864E-08 3,8866526E-06 -2,4043160E-05 -4,8428574E-07 A12 = -1,0294712E-09 -4,5243721E-07 1,4465207E-06 -3,7604591E-07 A14 = 9,2150349E-12 2,8677430E-08 -4,6258038E-08 -1,2304211E-06 A16 = -3,4275952E-14 -7,0633143E-10 6,1100136E-10 2,1557759E-07 A18 = - - - -1,0761736E-08 Surface # 6 7 9 10 k = 8,59276E+01 -2,56795E+00 6,66124E+01 -7,02888E-01 A4 = -1,7212408E-04 1,6759216E-04 -1,9186199E-04 -5,8751306E-03 A6 = -7,7240776E-04 -5,7105296E-04 -3,5101287E-04 6,4203586E-03 A8 = 2,0596575E-04 9,5242314E-05 1,1624772E-04 -3,9514014E-03 A10 = -5,8185348E-05 -2,3477607E-05 -7,6662745E-06 1,6374010E-03 A12 = 8,7493894E-06 3,8166894E-06 2,1312276E-06 -3,7254814E-04 A14 = -7,2101659E-07 -3,3255124E-07 1,1539082E-07 3,7154461E-05 A16 = 2,2476624E-08 1,2649464E-08 - - Surface # 12 13 14 15 k = 5,94759E+00 -2,53205E-01 -1,36867E+00 -7,75340E-01 A4 = -1,2255221E-02 1,4197088E-02 3,5281981E-03 -3,1956160E-02 A6 = 9,0305634E-03 -1,8650671E-02 -7,1212404E-03 2,0412319E-02 A8 = -5,7586633E-03 4,6587227E-03 -2,9612190E-03 -1,1590306E-02 A10 = 1,9854779E-03 1,3270995E-03 4,8569893E-03 4,8572510E-03 A12 = -1,0854703E-04 -1,1052321E-03 -2,2091513E-03 -1,4103869E-03 A14 = -1,7059526E-04 2,5405055E-04 4,7126480E-04 2,7260194E-04 A16 = 5,4619142E-05 -2,0418111E-05 -4,2940785E-05 -3,3069775E-05 A18 = -5,2295672E-06 - 8,2948140E-07 2,2681197E-06 A20 = - - - -6,7440108E-08 Surface # 16 17 18 19 k = -5,56317E-01 -6,50483E+00 -3,00237E+01 6,51511E-01 A4 = -2,4887859E-02 -1,3457297E-02 3,1743101E-03 -1,3754848E-02 A6 = 1,1463183E-02 3,7926445E-03 -4,4680147E-03 2,5885052E-03 A8 = -4,6441278E-03 -1,1789500E-03 1,2354804E-03 -7,2005956E-04 A10 = 1,3622091E-03 3,2183861E-04 -1,8284739E-04 1,3129075E-04 A12 = -2,7463303E-04 -6,5754885E-05 7,2629938E-06 -1,4519711E-05 A14 = 3,5750768E-05 8,3438803E-06 1,2121859E-06 9,3062730E-07 A16 = -2,6650741E-06 -5,6760743E-07 -1,3677100E-07 -3,2077278E-08 A18 = 8,5651255E-08 1,5989545E-08 3,8241751E-09 4,6191270E-10

[0185] In the 7th embodiment, the equation of the aspherical surface profiles of the above-mentioned lens elements is the same as the equation of the 1st embodiment.

[0186] The definitions of the parameters listed in Table 7D are also the same as in the 1st embodiment, with corresponding values ​​for the 7th embodiment, so no further explanation is given here.

[0187] Furthermore, these parameters from Table 7A, Table 7B and Table 7C can be calculated as the following values ​​and must meet the following conditions: TABLE 7D Schematic parameters fd [mm] 2,29 (R9-R16) / (R9+R16) 0,19 Fnod 1,75 (R11+R12) / (R11-R12) 0,13 HFOVd [Grade] 75,0 |R12-R13| / T67 0,68 TLd / fd 9,56 CT1 / T23 0,79 TLd / ImgH 6,07 CT1 / CT7 0,55 TD / BLd 14,98 T12 / T23 1,27 Σ|fd / fid| 3,48 T23 / CT3 1,05 |f1d / R1| 0,65 N8d 1,551 |f2d / f6d| 2,58 V2 / V3 2,87 |fd / R15|+|fd / R16| 0,97 Y1R1d / Y5R1d 4,50 fd / CT8 1,14 Y1R1d / ImgH 2,15 |R11 / fd| 2,20 Sag2R1d / CT2 1,53 (R5+R6) / (R5-R6) 0,43 - - 8. Design

[0188] Fig.Figure 15 is a perspective view of an image acquisition unit according to the 8th 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 assembly for photography disclosed in the 1st embodiment, a tube, and a retaining element (whose reference numerals have been omitted) for holding the optical lens assembly for photography. However, the lens unit 101 can alternatively be provided with the optical lens assembly 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.

[0189] The drive unit 102 can have an autofocus function, and different drive configurations can be achieved by using voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, or shape memory alloys. The drive unit 102 is advantageous for achieving better image positioning of the lens unit 101, enabling the lens unit 101 to capture a clear image of the object at varying distances. The image sensor 103 (e.g., CCD or CMOS), which can be characterized by high light sensitivity and low noise, is positioned on the image surface of the optical lens assembly for photography to achieve higher image quality.

[0190] The image stabilizer 104, 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 advantageous for compensating for panning and tilting movements of the lens unit 101, thereby reducing motion blur during exposure. In some cases, this compensation can be achieved through electronic image stabilization (EIS) using image processing software, which improves image quality in motion or low-light conditions. 9. Design

[0191] Fig. Figure 16 is a perspective view of an electronic device according to the 9th embodiment of the present disclosure. Fig.Figure 17 is another perspective view of the electronic device in Fig. 16.

[0192] 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 unit 201 disclosed in the 8th embodiment. As in Fig. As shown in Figure 16, 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 facing the same direction, and each of the image acquisition units 100, 100a, and 100b has a single focal point. As shown in Fig.As shown in Figure 17, the image acquisition unit 100c and the display unit 201 are arranged on the opposite side of the electronic device 200, so that the image acquisition unit 100c can be a forward-facing camera of the electronic device 200 for taking selfies, but the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100a, 100b and 100c can include the optical lens assembly for photography of 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, and each of the lens units can comprise an optical lens assembly for photography, such as the optical lens assembly for photography of the present disclosure, a tube and a retaining element for holding the optical lens assembly for photography.

[0193] 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, allowing the electronic device to have 200 different magnification ratios to meet the requirements of the optical zoom function. Furthermore, image capture unit 100c, as shown in Fig.As shown in Figure 17, the image acquisition unit 100c has a non-circular opening, and the tube or lens elements in the image acquisition unit 100c may have one or more truncated edges at the outer diameter positions thereof to conform to the non-circular opening. Therefore, it is advantageous to further reduce the length of the image acquisition unit 100c along a single axis, thereby reducing the overall size of the lens, increasing the area ratio of the display unit 201 to the electronic device 200, reducing the thickness of the electronic device 200, and achieving the compactness of the entire module. 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. 10. Design

[0194] Fig.Figure 18 is a perspective view of an electronic device according to the 10th embodiment of the present disclosure. Fig. Figure 19 is another perspective view of the electronic device in Fig. 18. Fig. 20 is a block diagram of the electronic device in Fig. 18.

[0195] In this embodiment, an electronic device 300 is a smartphone comprising the image acquisition unit 100, 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, as disclosed in the 8th embodiment. 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 be a user interface, so that the image acquisition units 100e, 100f, and 100g can be forward-facing 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 assembly 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 comprise a lens unit, a drive device, an image sensor and an image stabilizer, and each of the lens units can comprise an optical lens assembly for photography, such as the optical lens assembly for photography of the present disclosure, a tube and a retaining element for holding the optical lens assembly for photography.

[0196] 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 requirements of the optical zoom function. In addition, image acquisition unit 100g can determine 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.

[0197] When a user takes pictures of an object 306, the light beams 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 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 beam emitted by the focus assist module 302 can be either conventional infrared light or laser light. Additionally, the light beams can be 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. 11. Design

[0198] Fig. Figure 21 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure.

[0199] 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 8th embodiment. The image acquisition unit 100, the image acquisition unit 100h, and the image acquisition unit 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 assembly 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.

[0200] 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 can be a telephoto image acquisition unit with a light deflection element configuration, so 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 element configuration of the image acquisition unit 100h can, for example, be one of those described in Fig. 31 to Fig. The structures shown in section 33 may be similar, for which reference is made to the preceding descriptions. Fig. 31 to Fig. Reference can be made to Section 33, 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, light rays 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 embodiment described above, so the details relating thereto are not repeated. 12. Design

[0201] Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure.

[0202] 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 8th 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 assembly 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.

[0203] 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, each of the 100j and 100k image acquisition units can be a telephoto image acquisition unit with a light deflection element configuration. Moreover, the light deflection element configuration of each of the 100j and 100k image acquisition units can, for example, be one of those described in [reference missing]. Fig. 31 to Fig. The structures shown in section 33 may be similar, as described above. Fig. 31 to Fig.Reference can be made to Section 33, and the relevant details are not stated again. Furthermore, the image acquisition unit 100s can determine 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. 13. Design

[0204] Fig.Figure 23 is a schematic view of an electronic device according to the 13th embodiment of the present disclosure.

[0205] In this embodiment, an electronic device 600 can be a small camera, for example, an action camera. The electronic device 600 comprises a display unit 601 and an image acquisition unit 602. The image acquisition unit 602 is electrically connected to the display unit 601. The image acquisition unit 602 includes the optical lens assembly for photography disclosed in the first embodiment. The image acquisition unit 602 can be a wide-angle image acquisition unit. The image acquisition unit 602, which is similar to the image acquisition unit 100, can further comprise a tube, a mounting element, or a combination thereof. The electronic device 600 captures an image with the image acquisition unit 602. Preferably, the electronic device can further comprise a control unit, a display unit, a storage unit, a random-access memory (RAM) unit, or a combination thereof. 14. Design

[0206] Fig.Figure 24 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure. Fig. 25 is a side view of the electronic device in Fig. 24. Fig. 26 is a top view of the electronic device in Fig. 24.

[0207] In this embodiment, an electronic device 700 is a mobile vehicle, for example, a car. The electronic device 700 comprises a plurality of image acquisition units 701, and each of the image acquisition units 701 comprises, for example, the optical lens assembly for photography as described in the present disclosure. The image acquisition units 701 can, for example, serve as panoramic car cameras, dashboard cameras, and vehicle reversing cameras. The image acquisition units 701 can be wide-angle image acquisition units.

[0208] As in Fig. 24 to Fig.As shown in Figure 26, the 701 image acquisition units are positioned, for example, on the front, rear, sides, inside, or rearview mirror of the car to capture peripheral images of the vehicle. This is advantageous for capturing external traffic information to achieve advanced driver assistance functionality. Furthermore, the image software processor can stitch the peripheral images together to create a panoramic image, allowing the driver to check all corners surrounding the vehicle and thus facilitating parking and driving.

[0209] As in Fig. As shown in Figure 25, the image acquisition units 701, for example, are arranged on the lower part of the side mirrors to capture image information of the left and right lanes. As shown in Fig.As shown in Figure 26, the image acquisition units 701 can, for example, also be arranged on the lower part of the side mirrors and within the front and rear windshields to provide the driver with external information and a wider field of view, thereby reducing blind spots and improving driving safety. It should be noted that the arrangement of the image acquisition units 701 in the drawings is only exemplary and the number, positions, and image acquisition directions of the image acquisition units 701 can be adapted according to actual requirements. 15. Design

[0210] Fig. Figure 27 is a schematic view of an electronic device according to the 15th embodiment of the present disclosure.

[0211] In this embodiment, an electronic device 800 can be a light unmanned aerial vehicle, for example, a drone camera. The electronic device 800 comprises an image acquisition unit 801. The image acquisition unit 801 includes the optical lens assembly for photography disclosed in the first embodiment. The image acquisition unit 801 can be a wide-angle image acquisition unit. The image acquisition unit 801, which is similar to the image acquisition unit 100, can further comprise a tube, a holder, or a combination thereof. The electronic device 800 captures an image with the image acquisition unit 801. Preferably, the electronic device can further comprise a control unit, a display unit, a storage unit, a random-access memory (RAM) unit, or a combination thereof. 16. Design

[0212] Fig.Figure 28 is a schematic view of an electronic device according to the 16th embodiment of the present disclosure.

[0213] In this embodiment, an electronic device 900 can be a soundbox, for example, a smart speaker. The electronic device 900 comprises an image acquisition unit 901. The image acquisition unit 901 includes the optical lens assembly for photography disclosed in the first embodiment. The image acquisition unit 901 can be a wide-angle image acquisition unit. The image acquisition unit 901, which is similar to the image acquisition unit 100, can further comprise a tube, a mounting element, or a combination thereof. The electronic device 900 captures an image using the image acquisition unit 901. Preferably, the electronic device can further comprise a control unit, a display unit, a storage unit, a random-access memory (RAM) unit, or a combination thereof.

[0214] The smartphone, camera, mobile vehicle, unmanned aerial vehicle, and soundbox in various 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 these. The image acquisition unit can optionally be applied to optical systems with a movable focus.Furthermore, the optical lens assembly 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 TVs, 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.

[0215] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that TABLES 1A-7D 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 not intended to be exhaustive, nor are they intended 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 assembly for photography comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a negative refractive power, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the sixth lens element (E6) has a negative refractive power, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, 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 sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), measured at a reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the central thickness of the first lens element (E1) is CT1, the central thickness of the third lens element (E3) is CT3, the central thickness of the seventh lens element (E7) is CT7, the axial distance between the second lens element (E2) and the third lens element (E3) is T23, and the following conditions are met: 0<(R11+R12) / (R11−R12)<1.50; 4.00 <TLd / ImgH<6,50; 6.00 <TLd / fd<12,00; 0.10 <CT1 / CT7<0,80; und 0.60 <T23 / CT3<2,00. [2] Optical lens assembly for photography according to claim 1, wherein the second lens element (E2) has a negative refractive power and the fourth lens element (E4) has a positive refractive power; where the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG), measured at the reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, and the following condition is met: 4.50 <TLd / ImgH<6,30. [3] Optical lens assembly 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; where TLd is the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG), measured at the reference wavelength of the d-line, and fd is the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, and the following condition is met: 7.00 <TLd / fd<10,00. [4] Optical lens assembly for photography according to claim 1, wherein the object-side surface of the sixth lens element (E6) is concave in a paraxial region thereof; where the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, and the following condition is met: 0.10<(R11+R12) / (R11−R12)<0.

70. [5] Optical lens assembly according to claim 1, wherein the object-side surface of the first lens element (E1) is convex in a paraxial region thereof; wherein the central thickness of the first lens element (E1) is CT1, the central thickness of the third lens element (E3) is CT3, the central thickness of the seventh lens element (E7) is CT7, the axial distance between the second lens element (E2) and the third lens element (E3) is T23 and the following conditions are met: 0.20 <CT1 / CT7<0,65; und 0.70 <T23 / CT3<1,80. [6] Optical lens assembly for photography according to claim 1, wherein a focal length of the second lens element (E2), measured at the reference wavelength of the d-line, is f2d, a focal length of the sixth lens element (E6), measured at the reference wavelength of the d-line, is f6d and the following condition is met: 1.50<|f2d / f6d|<4.

00. [7] Optical lens assembly 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 image-side surface of the eighth lens element (E8) is R16 and the following condition is met: 0<(R9−R16) / (R9+R16)<0.

50. [8] Optical lens assembly for photography according to claim 1, wherein the image-side surface of the first lens element (E1) is concave in a paraxial region thereof, the object-side surface of the second lens element (E2) is convex 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 sixth lens element (E6) is concave in a paraxial region thereof, and the object-side surface of the seventh lens element (E7) is convex in a paraxial region thereof. [9] Optical lens assembly for photography according to claim 1, wherein an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8) is TD, an axial distance between the image-side surface of the eighth lens element (E8) and the image area (IMG), measured at the reference wavelength of the d-line, is BLd and satisfies the following condition 8.00 <TD / BLd<18,00. [10] Optical lens assembly for photography according to claim 1, wherein 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: 0.20 <T12 / T23<1,80. [11] Optical lens assembly for photography according to claim 1, wherein the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, is a central thickness of the eighth lens element (E8) CT8 and the following condition is met: 0.50 <fd / CT8<2,00. [12] Optical lens assembly for photography according to claim 1, wherein an f-number of the optical lens assembly for photography, measured at the reference wavelength of the d-line, Fnod, is half of a maximum field of view of the optical lens assembly for photography, measured at the reference wavelength of the d-line, HFOVd and the following conditions are met: 1.50 <Fnod<2,00; und 65.0 degrees <HFOVd<90,0 Grad. [13] Optical lens assembly for photography according to claim 1, wherein a displacement parallel to an optical axis from an axial vertex on the object-side surface of the second lens element (E2) to a position of the maximum effective radius on the object-side surface of the second lens element (E2), measured at the reference wavelength of the d-line, is Sag2R1d, a central thickness of the second lens element (E2) is CT2, and the following condition is met: 0.50 <Sag2R1d / CT2<2,50. [14] Optical lens assembly for photography according to claim 1, wherein a maximum effective radius of the object-side surface of the first lens element (E1), measured at the reference wavelength of the d-line, is Y1R1d, a maximum effective radius of the object-side surface of the fifth lens element (E5), measured at the reference wavelength of the d-line, is Y5R1d, the maximum image height of the optical lens assembly for photography is ImgH, and the following conditions are met: 1.50 <Y1R1d / ImgH<2,50; und 3.00 <Y1R1d / Y5R1d<5,00. [15] Image capture unit (100), comprising: the optical lens assembly for photography according to claim 1; and an image sensor (103) which is arranged on the image surface (IMG) of the optical lens assembly for photography. [16] Electronic device (200), comprising: the image acquisition unit (100) according to claim 15. [17] Optical lens assembly for photography comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a negative refractive power, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fourth lens element (E4) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the sixth lens element (E6) has a negative refractive power, the object-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, 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 R1 is the radius of curvature of the object-side surface of the first lens element (E1), R11 is the radius of curvature of the object-side surface of the sixth lens element (E6), R12 is the radius of curvature of the image-side surface of the sixth lens element (E6), R15 is the radius of curvature of the object-side surface of the eighth lens element (E8), R16 is the radius of curvature of the image-side surface of the eighth lens element (E8), TLd is the axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), measured at a reference wavelength of the d-line, TLd is the maximum image height of the optical lens assembly for photography, ImgH is the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, fd is the focal length of the first lens element (E1), measured at the reference wavelength of the d-line, f1d is a focal length of the second lens element (E2),measured at the reference wavelength of the d-line, f2d, is a focal length of the third lens element (E3), measured at the reference wavelength of the d-line, f3d, is a focal length of the fourth lens element (E4), measured at the reference wavelength of the d-line, f4d, is a focal length of the fifth lens element (E5), measured at the reference wavelength of the d-line, f5d, is a focal length of the sixth lens element (E6), measured at the reference wavelength of the d-line, f6d, is a focal length of the seventh lens element (E7), measured at the reference wavelength of the d-line, f7d, is a focal length of the eighth lens element (E8), measured at the reference wavelength of the d-line, f8d, is a focal length of the i-th lens element, measured at the reference wavelength of the d-line, fid, and the following conditions are met: 0<(R11+R12) / (R11−R12)<0.90; 4.00 <TLd / ImgH<6,50; 1.00<∑|fd / fid|<4.00,where i=1,2,3,4,5,6,7 and 8; 0.65 < |fd / R15| + |fd / R16| < 2.00; and 0.25<|f1d / R1|<1.

00. [18] Optical lens assembly for photography according to claim 17, wherein the second lens element (E2) has a negative refractive power and the fifth lens element (E5) has a positive refractive power; wherein the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12 and the following condition is met: 0.10<(R11+R12) / (R11−R12)<0.

65. [19] Optical lens assembly for photography according to claim 17, wherein the object-side surface of the second lens element (E2) is convex in a paraxial region thereof and the image-side surface of the third lens element (E3) is convex in a paraxial region thereof; wherein the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the radius of curvature of the object-side surface of the eighth lens element (E8) is R15, the radius of curvature of the image-side surface of the eighth lens element (E8) is R16 and the following condition is satisfied: 0.80<|fd / R15|+|fd / R16|<1.

80. [20] Optical lens assembly for photography according to claim 17, wherein the first lens element (E1) is made of glass material; wherein the focal length of the first lens element (E1), measured at the reference wavelength of the d-line, is f1d, the radius of curvature of the object-side surface of the first lens element (E1) is R1 and the following condition is met: 0.35<|f1d / R1|<0.

85. [21] Optical lens assembly for photography according to claim 17, wherein the third lens element (E3) has a positive refractive power; wherein a radius of curvature of the object-side surface of the third lens element (E3) is R5, a radius of curvature of the image-side surface of the third lens element (E3) is R6 and the following condition is met: 0.20<(R5+R6) / (R5−R6)<2.

00. [22] Optical lens assembly for photography according to claim 17, wherein the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd and the following condition is met: 1.80<|R11 / fd|<5.

00. [23] Optical lens assembly for photography according to claim 17, wherein a central thickness of the first lens element (E1) is CT1, an axial distance between the second lens element (E2) and the third lens element (E3) is T23 and the following condition is met: 0.10 <CT1 / T23<1,00. [24] Optical lens assembly for photography according to claim 17, wherein an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3 and the following condition is met: 1.40 <V2 / V3<4,00. [25] Optical lens assembly for photography according to claim 17, wherein a refractive index of the eighth lens element (E8), measured at the reference wavelength of the d-line, is N8d and the following condition is met: 1,500 <N8d<1,600. [26] Optical lens assembly for photography according to claim 17, wherein the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the radius of curvature of the object-side surface of the seventh lens element (E7) is R13, the axial distance between the sixth lens element (E6) and the seventh lens element (E7) is T67 and the following condition is met: 0.01<|R12−R13| / T67<10.

00. [27] Optical lens assembly for photography according to claim 17, wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) comprise at least one positive lens element and the Abbe number of the at least one positive lens element is less than 30.

0. [28] Optical lens assembly for photography according to claim 17, wherein the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the radius of curvature of the object-side surface of the eighth lens element (E8) is R15, the radius of curvature of the image-side surface of the eighth lens element (E8) is R16, the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG), measured at the reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, a central thickness of the first lens element (E1) is CT1, a central thickness of the third lens element (E3) is CT3, a central thickness of the seventh lens element (E7) CT7 is,an axial distance between the second lens element (E2) and the third lens element (E3) T23, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the focal length of the first lens element (E1), measured at the reference wavelength of the d-line, is f1d, the focal length of the second lens element (E2), measured at the reference wavelength of the d-line, is f2d, the focal length of the third lens element (E3), measured at the reference wavelength of the d-line, is f3d, the focal length of the fourth lens element (E4), measured at the reference wavelength of the d-line, is f4d, the focal length of the fifth lens element (E5), measured at the reference wavelength of the d-line, is f5d, the focal length of the sixth lens element (E6), measured at the reference wavelength of the d-line, is f6d, the focal length of the seventh lens element (E7), measured at the Reference wavelength of the d-line, f7d is,the focal length of the eighth lens element (E8), measured at the reference wavelength of the d-line, f8d, is the focal length of the i-th lens element, measured at the reference wavelength of the d-line, fid, and the following conditions are met: 0.13≤(R11+R12) / (R11−R12)≤1.21; 5.00≤TLd / ImgH≤6.07; 7.72≤TLd / ImgH≤6.07; 0.38≤CT1 / CT7≤0.55; 0.81≤T23 / CT3≤1.44; 2.16≤∑|fd / fid|≤3.48,where i=1,2,3,4,5,6,7 and 8; 0.97 ≤ |fd / R15| + |fd / R16| ≤ 1.54; and 0.43≤|f1d / R1|≤0.72.

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