Wide-conversion lens and a zoom lens with it

Details Wide-conversion lens and a zoom lens with it Wide-conversion lens and a zoom lens with it

1993-09-01

1996-09-10

Epps, Georgia Y.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359793, G02B 1502

Patent

active

055551327

ABSTRACT:
A wide-conversion lens for attachment to a master lens system consists of a bi-negative first lens in a object side and a bi-positive second lens in a master lens side, and in the second lens its radii of curvature of both surfaces are selected the same.

REFERENCES:
patent: 2854891 (1958-10-01), Schade
patent: 4818081 (1989-04-01), Ito
patent: 4929069 (1990-05-01), Shibayama
patent: 4936661 (1990-06-01), Betensky et al.

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