Wide-angle lens system of a retrofocus type

Details Wide-angle lens system of a retrofocus type Wide-angle lens system of a retrofocus type

1989-09-26

1990-06-19

Arnold, Bruce Y.

G02B 1318

Patent

active

049347977

ABSTRACT:
A wide-angle lens system of a retrofocus type comprises, in order from the object side, a weakly divergent front lens group and a convergent rear lens group and which effects focusing by moving only the rear lens group. The front lens group comprises, in order from the object side, a positive first lens having a convex surface directed toward the object, a negative meniscus second lens having a convex surface directed toward the object and a biconvex third lens. The lens system satisfies the following conditions:

REFERENCES:
patent: 4759619 (1988-07-01), Nakamura et al.

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