Retrofocus type lens

Details Retrofocus type lens Retrofocus type lens

1975-10-24

1977-04-19

Corbin, John K.

G02B 1304

Patent

active

040185125

ABSTRACT:
A negative meniscus lens, a biconvex lens, a cemented biconcave lens, a cemented positive meniscus lens, a positive meniscus lens, and a positive lens arranged from the front to rear in this order constitute a retrofocus lens having a large diameter and short length with reduced aberrations. The air separation between the first lens and the second lens is designed to be longer than 0.45f and shorter than 0.75f to make the overall length of the lens system small without extremely increasing the refractive power of the first lens. The ratio of the radius of curvature of the front face of the second lens to that of the rear face thereof is designed to be greater than 0.33 and less than 0.6 to compensate for the spherical aberration and coma due to the first lens. The cemented face of the cemented biconcave lens located behind the second lens is designed to be convex to the rear.

REFERENCES:
patent: 3731989 (1973-05-01), Skimizu
patent: 3748021 (1973-07-01), Tajima et al.

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