Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

1998-03-26

2000-06-13

Epps, Georgia

Optical: systems and elements

Lens

Reverse telephoto

359754, G02B 1304

Patent

active

060756578

ABSTRACT:
A wide-angle lens system which has a long back focal length comprising a first lens unit having a negative power, a second lens unit having a positive power and a third lens unit having a positive power: the first lens unit being composed of a 1-1 positive lens unit which is composed only of a positive lens component and a 1-2 negative lens unit which is composed only of negative lens components, the third lens unit being composed of a 3-1 subunit which comprises at least a negative lens component and a 3-2 positive subunit which comprises at least a negative lens component, the 3-1 subunit being composed of a first negative lens component and a second positive lens component, and the 3-2 subunit being composed of a third negative lens component and a fourth positive lens component.

REFERENCES:
patent: 4061421 (1977-12-01), Nakagawa
patent: 4163603 (1979-08-01), Tsunashima
patent: 4431273 (1984-02-01), Nakamura
patent: 5159493 (1992-10-01), Tsutsumi

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