Wide Angle Interchangeable Lens

A technology of interchangeable lenses and wide-angle, applied in optical components, instruments, optics, etc., can solve the problems of inability to match the use of cameras, low resolution, and inability to meet the needs of video and movie shooting.

Active Publication Date: 2020-04-14
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main disadvantages include: 1. Insufficient resolution: almost all camera lenses currently on the market have low resolution and cannot match the current cameras with resolutions as high as 6k or 8k.
2. Obvious vignetting: Because the optical design of the camera lens does not consider the needs of video and movie shooting, the requirements for vignetting are often not high, so the vignetting is more obvious, which cannot meet the needs of video and movie shooting
3. Large distortion: The picture distortion of dynamic images is often more obvious than that of static photos
For film production, it is very common to focus on the screen or shift the focus between different subjects, so the requirements for suppressing the breathing effect are very high, and general camera lenses cannot meet the requirements

Method used

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  • Wide Angle Interchangeable Lens
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  • Wide Angle Interchangeable Lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, this embodiment includes a first lens group G1, a second lens group G2, and a third lens group G3 that are sequentially arranged from the object side to the image side, wherein: the first lens group G1 includes the first lens group G1 with negative refractive power. The lens L1, the second lens L2 with negative refractive power, the third cemented lens L3 with negative refractive power and the cemented surface convex toward the image side, the fourth lens L4 with positive refractive power; the second lens group G2 includes The cemented lens X1 with positive refractive power and the cemented surface convex toward the image side; the third lens group G3 includes the stop STP, the fifth cemented lens L5 with negative refractive power and the cemented surface facing the image side, and the first cemented lens with positive refractive power. Six lenses L6, a seventh lens L7 with negative refractive power, and an eighth lens L8 with positive refractiv...

Embodiment 2

[0044] The overall focal length of the wide-angle interchangeable lens in this embodiment is EFL=24mm, TNO=1.55 (TNO is the aperture value after calculating the transmittance of the lens), where: the second lens group G2 uses two separate lenses, the overall focal length is positive .

[0045] The lens structure parameters of this embodiment are as follows

[0046]

[0047]

Embodiment 3

[0048] The specific aspheric coefficients of the lens in Embodiment 3 are as follows:

[0049]

[0050]

[0051] Table 6

[0052] POS1 POS2 D0 INF350 FOV 41.9541.04

[0053] The process of changing from POS1 to POS2 is the process of changing the object distance from infinity to the closest photographing distance. FOV is the field of view of the lens. When changing, FOV only changes 2.2%, and the breathing effect is weak.

[0054] In this embodiment, the distance from the diaphragm to the center of the front lens L1=7.29, the distance from the diaphragm to the center of the rear lens L2=5.99, L1-L2=1.3; optical back focus BFL=34.67, overall focal length EFL=24, BFL / EFL =1.44; focal length F of the first lens group G1 G1 =77, overall focal length F=24, FG1 / F=3.21.

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Abstract

A wide-angle exchangeable lens includes a first lens group, a second lens group and a diaphragm-containing third lens group which are arranged in sequence from the object side to the image side. The first lens group includes a first lens which has negative focal power, a second aspheric lens which has negative focal power, a third glued lens which has negative focal power and of which the glued surface is towards the image side, and a fourth lens which has positive focal power. The third lens group includes a diaphragm, a fifth glued lens which has negative focal power and of which the glued surface is towards the object side, a sixth lens which has positive focal power, a seventh lens which has negative focal power, and an eighth aspheric lens which has positive focal power. The second lens group is composed of a glued lens which have positive focal power and of which the glued surface is towards the object side, or two separate lenses. The wide-angle exchangeable lens of the invention can adapt to the professional 8K-resolution (the highest resolution) camera on the market at present, and costs low.

Description

Technical field [0001] The present invention relates to a technology in the field of optical equipment for movies, in particular to a wide-angle interchangeable lens for 8k resolution cameras matching full frame and super35 frame. Background technique [0002] With the continuous emergence of low-cost, large-size photosensitive cameras, lens manufacturers began to make some modifications and whitewashing of camera lenses, using interchangeable lenses or "cinema style" lenses to market. However, in order to achieve a lower price, this part of the lens sacrificed some key film lens characteristics, and made compromises in terms of resolution and breathing effects. Its main disadvantages include: 1. Insufficient resolution: almost all camera lenses currently on the market have low resolution and cannot match the current cameras with resolutions up to 6k or 8k. 2. Obvious vignetting: Because the optical design of the camera lens does not consider the needs of video and film shooting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 尚洁阳诸益炜徐雄飞盛亚茗张平华
Owner JIAXING ZHONGRUN OPTICAL TECH
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