Photographic lens of a great aperture ratio

Details Photographic lens of a great aperture ratio Photographic lens of a great aperture ratio

1983-04-15

1986-11-11

Corbin, John K.

G02B 962, G02B 964

Patent

active

046219099

ABSTRACT:
A photographic lens of a great aperture ratio comprises, in succession from the object side, a first unit having a positive refractive power, a second unit having a positive refractive power, a third unit having a positive refractive power, and a stop member disposed between the first unit and the second unit. The first, second and third units are movable at different speeds toward the object side relative to the image plane during the shift from the infinity photography condition to the short distance photography condition. The photographic lens satisfies certain conditions.

REFERENCES:
patent: 4260223 (1981-04-01), Hamanishi
patent: 4553823 (1985-11-01), Kato et al.

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