Photographic lens with large aperture ratio

Details Photographic lens with large aperture ratio Photographic lens with large aperture ratio

1984-01-09

1987-10-27

Corbin, John K.

G02B 962

Patent

active

047025689

ABSTRACT:
A photographic lens with a large aperture ratio comprises a plurality of lens elements brighter than F 1.5 and having a total covering power of at least 40.degree., with at least one of the lens elements being capable of passing an entire luminous flux focusing on a center of an image plane through at least 80 percent of a lens aperture thereof, and given a monotonous refractive index variation in the direction of an optical axis of the lens.

REFERENCES:
patent: 3486808 (1969-12-01), Hamblen
patent: 3637295 (1972-01-01), Matsumura et al.
patent: 4182550 (1980-01-01), Yamaguchi
patent: 4508434 (1985-04-01), Ogawa

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