2.8 fixed-focus ultra-wide-angle lens
An ultra-wide-angle lens and lens technology, used in installation, optics, instruments, etc., can solve the problems of low optical performance indicators, inability to have ultra-wide-angle, high-resolution large relative aperture, day and night confocal, etc., to achieve uniform illumination, high Resolution, effect of excellent aberration correction
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[0013] Such as figure 1 As shown, a 2.8 fixed-focus ultra-wide-angle lens, the optical system of the lens is respectively provided with a front group A, a diaphragm C and a rear group B along the incident direction of light from left to right, and the front group A is sequentially provided with a negative The crescent lens A-1, the negative crescent lens A-2 and the biconvex lens A-3, the focal length f of the front group A A =-9.8mm; the rear group B is sequentially provided with a biconvex lens B-1 and a cemented group consisting of a biconvex lens B-2 and a positive crescent lens B-3, and the focal length of the rear group B is f B =5.67mm.
[0014] In this embodiment, the air interval between the front group A and the rear group B is 1.16 mm; the air interval between the negative crescent lens A-1 and the negative crescent lens A-2 in the front group A is The air gap between the negative crescent lens A-2 and the bi-convex lens A-3 is 0.79 mm; the air gap between the bi-...
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