Conversion lens

Details Conversion lens Conversion lens

1989-09-21

1990-05-29

Sugarman, Scott J.

350432, 350465, 350474, 350477, G02B 1502, G02B 1318, G02B 912, G02B 960

Patent

active

049290681

ABSTRACT:
A front conversion lens is disclosed comprising, from front to rear, a first lens unit made of glass material, a second lens unit made of plastic material, and a third lens unit made of glass material.

REFERENCES:
patent: 3094580 (1963-06-01), Rosier
patent: 3319553 (1967-05-01), Vogel
patent: 4394071 (1983-07-01), Yamada
patent: 4768868 (1988-09-01), Wakamiya et al.

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