Large aperture ratio wide-angle photographic lens system

Details Large aperture ratio wide-angle photographic lens system Large aperture ratio wide-angle photographic lens system

1985-12-13

1988-09-13

Corbin, John K.

350458, 350463, G02B 1318, G02B 1304, G02B 900

Patent

active

047705124

ABSTRACT:
A large aperture ratio wide-angle photographic lens system comprising a first, second and third lens groups in which an aspherical surface is provided to a lens located near a stop and having a comparative low refractive index, the large aperture ratio wide-angle photographic lens system being thereby arranged that aberrations, especially coma flare, are corrected favorably up to the marginal portion and arranged to be compact in size.

REFERENCES:
patent: 3864026 (1975-02-01), Glatzel
patent: 3992085 (1976-11-01), Momiyama
patent: 4310222 (1982-01-01), Ikemori
patent: 4666261 (1987-05-01), Arai
patent: 4668056 (1987-05-01), Braat et al.

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