Wide-spectrum high-sensitivity low-light lens

Abstract

The wide-spectrum high-sensitivity low-light-level lens sequentially comprises a first lens, a first bonding lens, a diaphragm, a second bonding lens and a third bonding lens from an object side to an image side along an optical axis, wherein the first lens is a lens with positive focal power; the first balsaming lens comprises a second lens and a third lens, the second balsaming lens comprises a fourth lens and a fifth lens, and the third balsaming lens comprises a sixth lens and a seventh lens; the second lens, the fourth lens and the sixth lens are biconvex lenses with positive focal power; and the third lens, the fifth lens and the seventh lens are biconcave lenses with negative focal power. According to the embodiment of the invention, the low-light-level lens which is high in resolution, low in distortion and confocal in day and night is realized, and can be widely applied to the technical field of optical lenses.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a wide-spectrum, high-sensitivity, low-light-level lens. Background Art

[0002] Traditional visible light lenses are suitable for environments with good lighting conditions; in low-light conditions, such as foggy weather or dark environments, traditional visible light lenses cannot capture clear images. Low-light lenses can capture images in low-light environments. However, existing low-light lenses have a large number of lenses, are bulky and heavy, and produce low-resolution and insufficiently clear images. They can only function normally in dark environments, and will experience halos in brighter light environments, and have a high degree of distortion. Summary of the Invention

[0003] In view of this, an object of the embodiments of the present invention is to provide a low-light-level lens with a wide spectrum and high sensitivity, thereby achieving a low-light-level lens with high resolution, low distortion, and day and night confocality.

[0004] In a first aspect, an embodiment of the present invention provides a wide-spectrum, high-sensitivity micro-light lens, which includes, along the optical axis from the object side to the image side, a first lens, a first cemented lens, an aperture, a second cemented lens, and a third cemented lens; wherein the first lens is a lens with positive focal length, the object side surface is convex, and the image side surface is concave; the first cemented lens includes a second lens and a third lens, the second cemented lens includes a fourth lens and a fifth lens, and the third cemented lens includes a sixth lens and a seventh lens; the second lens, the fourth lens, and the sixth lens are all biconvex lenses with positive focal length; the third lens, the fifth lens, and the seventh lens are all biconcave lenses with negative focal length.

[0005] Optionally, the focal length of the first lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0006]

[0007] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light lens, and f1 is the focal length of the first lens.

[0008] Optionally, the focal length of the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0009]

[0010] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light-level lens, and f2 is the focal length of the first cemented lens.

[0011] Optionally, the focal length of the second lens in the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0012]

[0013] The focal length of the third lens in the first cemented lens and the focal length of the wide spectrum high sensitivity low light level lens meet the following requirements:

[0014]

[0015] Among them, f is the focal length of the wide spectrum high-sensitivity low-light lens, f3 is the focal length of the second lens, and f4 is the focal length of the third lens.

[0016] Optionally, the focal length of the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0017]

[0018] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light-level lens, and f5 is the focal length of the second cemented lens.

[0019] Optionally, the focal length of the fourth lens in the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0020]

[0021] The focal length of the fifth lens in the second cemented lens and the focal length of the wide spectrum high sensitivity low light level lens meet the following requirements:

[0022]

[0023] Among them, f is the focal length of the wide spectrum high sensitivity low light lens, f6 is the focal length of the fourth lens, and f7 is the focal length of the fifth lens.

[0024] Optionally, the focal length of the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0025]

[0026] Where f is the focal length of the wide-spectrum, high-sensitivity low-light-level lens, and f8 is the focal length of the third doublet lens.

[0027] Optionally, the focal length of the sixth lens in the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0028]

[0029] The focal length of the seventh lens in the third cemented lens and the focal length of the wide spectrum high sensitivity low light level lens meet the following requirements:

[0030]

[0031] Among them, f is the focal length of the wide spectrum high sensitivity low light lens, f9 is the focal length of the sixth lens, and f10 is the focal length of the seventh lens.

[0032] Optionally, the operating wavelength of the wide spectrum high-sensitivity low-light level lens is in the range of 450-1050 nm.

[0033] Optionally, the relative illumination of the wide-spectrum high-sensitivity low-light-level lens is greater than 83%.

[0034] The implementation of the embodiments of the present invention includes the following beneficial effects: The embodiments of the present invention provide a wide-spectrum, high-sensitivity micro-light lens, which includes, along the optical axis from the object side to the image side, a first lens, a first cemented lens, an aperture, a second cemented lens, and a third cemented lens; wherein the first lens is a lens with positive focal length; the first cemented lens includes a second lens and a third lens, the second cemented lens includes a fourth lens and a fifth lens, and the third cemented lens includes a sixth lens and a seventh lens; the second lens, the fourth lens, and the sixth lens are all biconvex lenses with positive focal length; the third lens, the fifth lens, and the seventh lens are all biconcave lenses with negative focal length. By using a combination of a convex lens and three cemented lenses, the volume and weight of the micro-light lens provided by the embodiments of the present invention are reduced; by sequentially combining the first lens, the first cemented lens, the aperture, the second cemented lens, and the third cemented lens along the optical axis from the object side to the image side, the micro-light lens provided by the embodiments of the present invention achieves a micro-light lens with high resolution, low distortion, and day and night confocality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a wide-spectrum, high-sensitivity low-light-level lens provided by an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the optical path of a wide-spectrum, high-sensitivity low-light-level lens provided by an embodiment of the present invention;

[0037] Figure 3 1 is a schematic diagram of a wide-spectrum, high-sensitivity low-light-level lens provided by an embodiment of the present invention;

[0038] Figure 4 : is a field curvature curve and distortion curve of a wide spectrum high-sensitivity low-light-level lens provided by an embodiment of the present invention; wherein, Figure 4 (a) is the field curvature curve. Figure 4 (b) is the distortion curve;

[0039] Figure 5 This is a modulation transfer function curve diagram of a wide-spectrum, high-sensitivity low-light-level lens provided by an embodiment of the present invention;

[0040] Figure 6 : is a field curvature curve and distortion curve of another wide spectrum high sensitivity low light level lens provided by an embodiment of the present invention; wherein, Figure 6(a) is the field curvature curve. Figure 6 (b) is the distortion curve;

[0041] Figure 7 This is a modulation transfer function curve diagram of another wide-spectrum, high-sensitivity low-light-level lens provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are provided for ease of description only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted based on the understanding of those skilled in the art.

[0043] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0044] In the following description, the terms "first\second\third" are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0045] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the embodiments of the present invention are for the purpose of describing the embodiments of the present invention only and are not intended to limit the present invention.

[0046] Before further explaining the embodiments of the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are subject to the following interpretations.

[0047] like Figure 1 As shown, an embodiment of the present invention provides a wide-spectrum, high-sensitivity micro-light lens, which includes, along the optical axis from the object side to the image side, a first lens 1, a first cemented lens, an aperture 8, a second cemented lens, and a third cemented lens; wherein the first lens 1 is a lens with positive focal length, with a convex object-side surface and a concave image-side surface; the first cemented lens includes a second lens 2 and a third lens 3, the second cemented lens includes a fourth lens 4 and a fifth lens 5, and the third cemented lens includes a sixth lens 6 and a seventh lens 7; the second lens 2, the fourth lens 4, and the sixth lens 6 are all biconvex lenses with positive focal length; the third lens 3, the fifth lens 5, and the seventh lens 7 are all biconcave lenses with negative focal length.

[0048] Specifically, the low-light lens provided by the embodiment of the present invention also includes a protective sheet 10, which is arranged between the seventh lens 7 and the image plane 9, or the protective sheet 10 is arranged in a camera using the low-light lens provided by the embodiment of the present invention, and the protective sheet 10 in the camera is arranged on the side of the photosensitive chip close to the seventh lens 7.

[0049] Specifically, the protective sheet 10 is used to protect the photosensitive chip; the material of the protective sheet 10 includes glass, and the specific material is determined according to actual conditions and is not limited in the embodiment of the present invention.

[0050] Specifically, if Figure 2 As shown, the incident light passes through the first lens 1, the second lens 2, the third lens 3, the aperture 8, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the protective sheet 10 in sequence, and is irradiated on the image plane 9 to form an image.

[0051] Specifically, in a camera using the low-light-level lens provided by an embodiment of the present invention, the image plane 9 is the surface of the photosensitive chip.

[0052] Specifically, the aperture is used to limit the beam of incident light.

[0053] Optionally, the focal length of the first lens 1 and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0054]

[0055] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light level lens, and f1 is the focal length of the first lens 1 .

[0056] Specifically, the focal length of the first lens 1 is in the range of 0.005 to 0.02 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the first lens 1 is 0.013 mm. -1 .

[0057] Optionally, the focal length of the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0058]

[0059] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light-level lens, and f2 is the focal length of the first cemented lens.

[0060] Specifically, the first cemented lens is composed of a biconvex lens and a biconcave lens, the biconvex lens is close to the object side, and the biconcave lens is close to the image side; the first cemented lens is used to eliminate chromatic aberration.

[0061] Optionally, the focal length of the second lens 2 in the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0062]

[0063] The focal length of the third lens 3 in the first cemented lens and the focal length of the wide spectrum high sensitivity low light level lens satisfy:

[0064]

[0065] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light lens, f3 is the focal length of the second lens 2, and f4 is the focal length of the third lens 3.

[0066] Specifically, the focal length of the second lens 2 is in the range of 0.005 to 0.015 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the second lens 2 is 0.01 mm. -1 .

[0067] Specifically, the focal length of the third lens 3 is in the range of -0.01 to -0.03 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the third lens 3 is -0.02 mm. -1 .

[0068] Optionally, the focal length of the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0069]

[0070] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light-level lens, and f5 is the focal length of the second cemented lens.

[0071] Specifically, the second cemented lens is composed of a biconvex lens and a biconcave lens, the one close to the object side is the biconvex lens, and the one close to the image side is the biconcave lens; the second cemented lens is used to eliminate chromatic aberration.

[0072] Optionally, the focal length of the fourth lens 4 in the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0073]

[0074] The focal length of the fifth lens 5 in the second cemented lens and the focal length of the wide spectrum high sensitivity low light level lens satisfy:

[0075]

[0076] Wherein, f is the focal length of the wide spectrum high-sensitivity low-light lens, f6 is the focal length of the fourth lens 4, and f7 is the focal length of the fifth lens 5.

[0077] Specifically, the focal length of the fourth lens 4 is in the range of 0.01 to 0.02 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the fourth lens 4 is 0.014 mm. -1 .

[0078] Specifically, the focal length of the fifth lens 5 is in the range of -0.01 to -0.02 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the fifth lens 5 is -0.012 mm. -1 .

[0079] Optionally, the focal length of the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy:

[0080]

[0081] Where f is the focal length of the wide-spectrum, high-sensitivity low-light-level lens, and f8 is the focal length of the third doublet lens.

[0082] Specifically, the third cemented lens is composed of a biconvex lens and a biconcave lens, the biconvex lens close to the object side and the biconcave lens close to the image side; the third cemented lens is used to eliminate chromatic aberration.

[0083] Optionally, the focal length of the sixth lens 6 in the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy:

[0084]

[0085] The focal length of the seventh lens element 7 in the third cemented lens and the focal length of the wide spectrum high sensitivity low light level lens satisfy:

[0086]

[0087] Among them, f is the focal length of the wide spectrum high sensitivity low light lens, f9 is the focal length of the sixth lens 6, and f 10 is the focal length of the seventh lens 7.

[0088] Specifically, the focal length of the sixth lens 6 is in the range of 0.025 to 0.035 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the sixth lens 6 is 0.031 mm. -1 .

[0089] Specifically, the focal length of the seventh lens 7 is in the range of -0.03 to -0.04 mm. -1 The specific focal length range is determined according to the actual situation and is not limited in the embodiments of the present invention. The embodiments are only provided for reference. For example, the focal length of the seventh lens 7 is -0.035mm. -1 .

[0090] Optionally, the operating wavelength of the wide spectrum high-sensitivity low-light level lens is in the range of 450-1050 nm.

[0091] Specifically, through simulation, it is found that the operating wavelength range of the low-light level lens provided by the embodiment of the present invention is 450-1050 nm, which includes the range of visible light and infrared light. It can work in a dark environment and capture clear images.

[0092] Specifically, through simulation, it is found that the focusing range of the low-light-level lens provided by the embodiment of the present invention is 50m to ∞.

[0093] Optionally, the relative illumination of the wide-spectrum high-sensitivity low-light-level lens is greater than 83%.

[0094] Specifically, through simulation, it is found that the relative illumination of the low-light level lens provided by the embodiment of the present invention is greater than 83%.

[0095] In a specific embodiment, through simulation, it is obtained that the target surface size of the wide-spectrum high-sensitivity low-light level lens is 2560×1440μm, and the diagonal of the target surface is 3μm; the focal length of the wide-spectrum high-sensitivity low-light level lens is 105mm; the distortion rate is 0.3%; and the operating temperature range is -40 to 60°C.

[0096] like Figure 3 As shown, in another specific embodiment, the wide-spectrum high-sensitivity low-light-level lens includes a protective sheet 10, and the surface sequence of the protective sheet 10 is S12 and S13; S4 is the cemented surface of the first cemented lens; S7 is the cemented surface of the second cemented lens; S10 is the cemented surface of the third cemented lens; the parameters of the wide-spectrum high-sensitivity low-light-level lens are shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] Specifically, the field curvature curve and distortion curve of the micro-light lens provided by the embodiment of the present invention under the conditions of incident light with wavelengths of 450nm, 486nm, 587nm and 665nm are as follows: Figure 4As shown in the figure, the ordinate is the field of view angle, the abscissa of the field curvature curve is in millimeters, and the abscissa of the distortion curve is in percentages. Field curvature is an aberration that forms a curved image on the object plane, and is characterized by meridional and sagittal field curvature. Excessive field curvature and distortion will seriously affect the off-axis imaging quality of the optical system. When the distortion of the lens is less than 4%, it is difficult for the human eye to detect. Figure 4 It can be seen that the distortion curves of incident light of 450nm, 486nm, 587nm and 665nm are not much different and basically coincide with each other; the incident light with a wavelength of 587nm has the largest field curvature value, which is about 0.033, and the maximum distortion value is 0.22%.

[0101] Specifically, the MTF (Modulation Transfer Function) curves of the micro-light lens provided by the embodiment of the present invention under the conditions of incident light with wavelengths of 450nm, 486nm, 587nm and 665nm are as follows: Figure 5 As shown in the figure, the horizontal axis is the spatial frequency, the unit of spatial frequency is lp / mm (line pairs per millimeter), and the vertical axis is the OTF coefficient (Optical Transfer Function). The smoother the MTF curve, the better the imaging quality of the lens. Figure 5 It can be seen that the OTF coefficient of the MTF curve at the edge of the field of view is 0.26 when the spatial frequency is 180lp / mm, which meets the requirements of night imaging.

[0102] Specifically, the field curvature curve and distortion curve of the micro-light lens provided by the embodiment of the present invention under the conditions of incident light with wavelengths of 750nm, 850nm, 950nm and 1050nm are as follows: Figure 6 As shown, the ordinate is the field of view angle, the abscissa of the field curvature curve is millimeters, and the abscissa of the distortion curve is percentage. Figure 6 It can be obtained that the incident light with a wavelength of 750 nm has the largest field curvature value, the field curvature value of the incident light with a wavelength of 750 nm is 0.036, and the maximum distortion value is 0.23%.

[0103] Specifically, the MTF curves of the micro-light lens provided by the embodiment of the present invention are as follows when the incident light has wavelengths of 750nm, 850nm, 950nm and 1050nm. Figure 7 As shown, the horizontal axis is the spatial frequency, the unit of spatial frequency is lp / mm (line pairs per millimeter), and the vertical axis is the OTF coefficient; among them, the smoother the MTF curve, the better the imaging quality of the lens. Figure 7 It can be seen that the OTF coefficient of the MTF curve at the edge of the field of view is 0.12 when the spatial frequency is 180lp / mm, which meets the requirements of night imaging.

[0104] The implementation of the embodiments of the present invention has the following beneficial effects: The embodiments of the present invention provide a wide-spectrum, high-sensitivity micro-light lens, which includes, along the optical axis from the object side to the image side, a first lens, a first cemented lens, an aperture, a second cemented lens, and a third cemented lens in sequence; wherein the first lens is a lens with positive focal length; the first cemented lens includes a second lens and a third lens, the second cemented lens includes a fourth lens and a fifth lens, and the third cemented lens includes a sixth lens and a seventh lens; the second lens, the fourth lens, and the sixth lens are all biconvex lenses with positive focal length; the third lens, the fifth lens, and the seventh lens are all biconcave lenses with negative focal length. By using a combination of a convex lens and three cemented lenses, the volume and weight of the micro-light lens provided by the embodiments of the present invention are reduced; the micro-light lens provided by the embodiments of the present invention has a smooth modulation transfer function curve under light with a wavelength of 450 to 1050 nm, high imaging quality, and improved resolution; and at the edge of the field of view, the optical function transfer coefficient meets the requirements for night imaging, achieving day and night confocality; the maximum distortion value of the incident light is no more than 0.23%, achieving a low-distortion micro-light lens.

[0105] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A wide spectrum, high-sensitivity low-light-level lens, characterized in that: The optical system comprises, from the object side to the image side, a first lens, a first cemented lens, a stop, a second cemented lens and a third cemented lens in sequence; wherein, the first lens is a lens with positive focal power, with a convex object-side surface and a concave image-side surface; the first cemented lens comprises a second lens and a third lens, the second cemented lens comprises a fourth lens and a fifth lens, and the third cemented lens comprises a sixth lens and a seventh lens; the second lens, the fourth lens and the sixth lens are all biconvex lenses with positive focal power; the third lens, the fifth lens and the seventh lens are all biconcave lenses with negative focal power.

2. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the first lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: Wherein, f is the focal length of the wide spectrum high-sensitivity low-light level lens, and f1 is the focal length of the first lens.

3. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy: Wherein, f is the focal length of the wide spectrum high-sensitivity low-light level lens, and f2 is the focal length of the first cemented lens.

4. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the second lens in the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: The focal length of the third lens in the first cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: Among them, f is the focal length of the wide spectrum high-sensitivity low-light lens, f3 is the focal length of the second lens, and f4 is the focal length of the third lens.

5. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light-level lens satisfy: Wherein, f is the focal length of the wide spectrum high-sensitivity low-light level lens, and f5 is the focal length of the second cemented lens.

6. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the fourth lens in the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: The focal length of the fifth lens in the second cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: Among them, f is the focal length of the wide spectrum high-sensitivity low-light lens, f6 is the focal length of the fourth lens, and f7 is the focal length of the fifth lens.

7. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light level lens satisfy: Wherein, f is the focal length of the wide spectrum high-sensitivity low-light level lens, and f8 is the focal length of the third cemented lens.

8. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The focal length of the sixth lens in the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: The focal length of the seventh lens in the third cemented lens and the focal length of the wide spectrum high-sensitivity low-light lens satisfy: Wherein, f is the focal length of the wide spectrum high sensitivity low light level lens, f8 is the focal length of the sixth lens, and f 10 is the focal length of the seventh lens.

9. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The operating wavelength of the wide spectrum high-sensitivity low-light level lens is in the range of 450 to 1050 nm.

10. The wide spectrum high sensitivity low light level lens according to claim 1, characterized in that: The relative illumination of the wide spectrum high-sensitivity low-light level lens is greater than 83%.

Images