Conversion lens system

Details Conversion lens system Conversion lens system

1978-10-02

1980-12-16

Sacher, Paul A.

350183, 350215, 350216, G02B 960, G02B 962, G02B 964

Patent

active

042393400

ABSTRACT:
A conversion lens system to be attached to an objective lens system at the image side thereof for converting the focal length of the objective lens system into a greater value is provided. The conversion lens system has a negative focal length and comprises seven single lens elements consisting of a first negative meniscus lens element convex to the object side, a second biconvex lens element, a third biconcave lens element, a fourth biconvex lens element, a fifth negative lens element having a concave front surface, a sixth positive lens element having a convex rear surface and a seventh biconcave lens element. All of the seven lens elements may be separated from the others, or alternatively, at least two of the second to fourth lens elements may be cemented to each other.

REFERENCES:
patent: 3877796 (1975-04-01), Yabe et al.
patent: 4126378 (1978-11-01), Ogino
patent: 4154508 (1979-05-01), Nakamura

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