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A fixed-focus lens, exchangeable technology, applied in optical components, optics, instruments, etc., can solve problems such as the inability to meet the requirements of video and movie shooting, and achieve the effect of being conducive to accurate exposure, improving peripheral brightness ratio, and improving resolution.
Active Publication Date: 2019-11-15
JIAXING ZHONGRUN OPTICAL TECH
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[0002] Due to demand, the performance indicators of movie lenses include: 1. Resolution: up to 6K or 8K; 2. No vignetting: The optical design of the camera lens does not consider the needs of video and movie shooting, and often does not have high requirements for vignetting. Therefore, the vignetting is more obvious, which cannot meet the requirements of video and movie shooting; 3. No distortion: because the distortion of the screen size will easily cause the viewer to feel dizzy, the movie lens must not have distortion similar to that of a camera lens; 4 , No breathing effect is obvious: the shooting technique of chasing focus in the movie screen or moving focus between different subjects has high requirements for suppressing the breathing effect
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Embodiment 1
[0025] Such as figure 1 As shown, this embodiment includes in order from the object side to the image side: the first lens group G1, the second lens group G2 and the third lens group G3, wherein: the first lens group G1 is fixedly arranged, the second lens group G2 and the third lens group G3 The three-lens group G3 moves from the image direction to the object side for floating focusing to effectively reduce the breathing effect.
[0026] The first lens group G1 includes in sequence: a first lens L1 with negative power, a second lens L2 with negative power, a third lens L3 with negative power, and a third lens L3 with positive power. Four lenses L4 and a fifth lens L5 with positive refractive power, wherein: the fourth lens L4 is a cemented lens.
[0027] The second lens group G2 includes in turn: a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, and an eighth lens L8 with positive refractive power, wherein: the sixth lens L6 is...
Embodiment 2
[0045] Such as Figure 4 As shown, compared with Embodiment 1, the lens parameters of this embodiment are shown in the table below.
[0046] Table 4 Embodiment 2 Structural parameters of lens lens
[0047]
[0048]
[0049] Wherein: the fourth lens L4, the sixth lens L6 and the eleventh lens L11 are cemented lenses, and the rear surface of the first lens is the front surface of the second lens.
[0050] Table 5 Embodiment 2 The change process of object distance and camera distance
[0052] Among them: the change of FOV is only 0.6%, and the breathing effect is extremely small.
[0053] Table 6 The aspheric coefficient of the lens of embodiment 2
[0054] face number K A (4th) B (6th) C(8th) D (10th) 3 0 3.43E-006 -1.74E-006 2.82E-009 -7.41E-009 4 0 6.12E-006 2.71E-006 -2.87E-007 -6.57E-010 5 ...
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Abstract
An ultra-wide-angle interchangeable prime lens comprises a first lens group, a second lens group and a third lens group in sequence from an object side to an image side, wherein the first lens group is fixedly disposed, and the second lens group and the third lens group move toward the object side from the image side for floating focusing. The ultra-wide-angle interchangeable prime lens comprisesa glass aspherical lens to improve resolution of the lens up to use requirement of a professional-grade camera with 8K resolution. The ultra-wide-angle interchangeable prime lens improves a peripheralbrightness ratio to more than 35% even at a maximal aperture, allowing light of the whole lens more uniform on a picture, thereby facilitating accurate exposure during film shooting. A lens structureand an optical path are optimized, in particular to enhance symmetry of the rear group of the lens, so that the TV distortion is below 1%, thereby ensuring that the picture is not deformed and distorted from the center to the periphery. Using floating focusing of the rear group of the lens and optimizing a distance between lenses in front and at back of the aperture at the same time make change of field of view within 1%, improving the problem of obvious breath effect of the camera lens.
Description
technical field [0001] The invention relates to a technology in the field of optical devices, in particular to an ultra-wide-angle interchangeable fixed-focus lens with a horizontal angle of up to 100°. Background technique [0002] Due to demand, the performance indicators of movie lenses include: 1. Resolution: up to 6K or 8K; 2. No vignetting: The optical design of the camera lens does not consider the needs of video and movie shooting, and often does not have high requirements for vignetting. Therefore, the vignetting is more obvious, which cannot meet the requirements of video and movie shooting; 3. No distortion: because the distortion of the screen size will easily cause the viewer to feel dizzy, the movie lens must not have distortion similar to that of a camera lens; 4 , No breathing effect is obvious: the shooting technique of chasing focus in the movie screen or moving focus between different subjects has high requirements for suppressing the breathing effect. C...
Claims
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Application Information
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