Ultra-short focus wide-angle lens
A wide-angle lens and ultra-short-focus technology, applied in installation, optics, instruments, etc., can solve the problem of short lens height and achieve the effect of ultra-short lens height, excellent waterproof performance, and high energy utilization rate
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[0015] An ultra-short-focus wide-angle lens, comprising a picture frame 1 and an end cap 2, in which a convex-convex lens 3, a plano-convex lens 4, a meniscus convex lens 6, a double-convex lens 7, and a curved Lunar concave lens 8 is formed, is separated by spacer ring 9 between the lens, biconvex lens 7 and meniscus concave lens 8 are cemented together, is provided with waterproof ring 5 between convex-concave lens 3 and picture frame 1, and waterproof effect is good.
[0016] The outer diameter of the convex-concave lens is 10.4mm, the near-object side spherical radius is 30mm, the far-object side concave spherical radius is 2.196mm, the central thickness of the lens is 1.93mm, and the material is ZLAF50;
[0017] The central thickness value of the plano-convex lens is 1.2 mm, the outer diameter is 5 mm, the spherical radius of the near object side is 4.715 mm, the far object side is a plane, and the material is K9;
[0018] The central thickness value of the meniscus conve...
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