Method of widening the angular field of a photographic objective

Details Method of widening the angular field of a photographic objective Method of widening the angular field of a photographic objective

1978-03-27

1985-05-21

Corbin, John K.

350428, G02B 1510, G02B 1518

Patent

active

045182272

ABSTRACT:
A varifocal objective lens or mono-focal objective lens with a macro-focusing mechanism is provided with a concave lens component detachably mounted at the front thereof to widen the angular field of view of the objective lens while adjusting the marco-focusing mechanism to a position, where the object position for which the objective lens is focused is substantially coincident with the position of the front focal point of the concave lens component.

REFERENCES:
patent: 1169731 (1916-01-01), Mengel
patent: 3736049 (1973-05-01), Shimizu
patent: 3748022 (1973-07-01), Tajima
patent: 3784284 (1974-01-01), Nakamura
patent: 3848968 (1974-11-01), Grey
patent: 3884555 (1975-05-01), Suwa

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