Behind stop wide angle lens system

Details Behind stop wide angle lens system Behind stop wide angle lens system

1991-04-02

1992-05-12

Arnold, Bruce Y.

Optical: systems and elements

Lens

With light limiting or controlling means

359753, G02B 956, G02B 1304

Patent

active

051132885

ABSTRACT:
A behind stop wide angle lens system comprises a negative meniscus lens L.sub.1 having a convex surface directed to the object, a positive meniscus lens L.sub.2 having a convex surface directed to the object, a double-side-concave negative lens L.sub.3 having both surfaces concaved, a double-side-convex positive lens L.sub.4 having both surfaces convexed, and a stop S. These lenses are arranged in the mentioned order from the end adjacent the object. The lenses satisfying the following conditions (1) to (4):

REFERENCES:
patent: 2725789 (1965-12-01), Schlegel

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