Method of focussing in a photographic lens system

Details Method of focussing in a photographic lens system Method of focussing in a photographic lens system

1978-11-24

1980-05-27

Sacher, Paul A.

350215, 350220, G02B 960

Patent

active

042047471

ABSTRACT:
A method of focussing in a photographic lens system consisting of a front convergent lens group and a rear divergent lens group, the front lens group comprising a first lens component having a positive refracting power, a second lens component having a negative refracting power and a third lens component having a positive refracting power, the improvement being that the third lens component is caused to move within the photographic lens system.

REFERENCES:
patent: 4045128 (1977-08-01), Momiyama

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