Large aperture ratio photographic lens system

Details Large aperture ratio photographic lens system Large aperture ratio photographic lens system

1984-10-29

1987-11-24

Corbin, John K.

350450, G02B 1302

Patent

active

047084456

ABSTRACT:
A large aperture ratio photographic lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a stop, and a third lens group comprising a negative lens element arranged in the rearmost position and having positive refractive power as a whole, the large aperture ratio photographic lens system being arranged to advance the lens system as a whole and, at the same time, to increase the airspace between the first and second lens groups when focusing on an object at a short distance from the state focused on an object at the infinite distance.

REFERENCES:
patent: 4457595 (1984-07-01), Mihara
patent: 4534626 (1985-08-01), Mihara
patent: 4558928 (1985-12-01), Imaizumi

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