Lens system for photographing objects from infinity to a very sh

Details Lens system for photographing objects from infinity to a very sh Lens system for photographing objects from infinity to a very sh

1979-08-16

1981-04-07

Clark, Conrad J.

350467, G02B 960, G02B 962

Patent

active

042602238

ABSTRACT:
A lens system for photographing objects from infinity to a very short distance has a forward group having a positive refractive power, a rearward group disposed rearwardly of the forward group and having a positive refractive power, and a diaphragm member provided between the two groups. The forward group is movable by a predetermined distance along the optic axis of the lens system in accordance with the object distance for focusing. The rearward group is movable by an amount smaller than the amount of movement of the forward group in the direction of the optic axis in accordance with the object distance for focusing.

REFERENCES:
patent: 3815974 (1974-06-01), Momiyama
patent: 3923369 (1975-12-01), Nakamura
patent: 3975090 (1976-08-01), Lawson
patent: 4029397 (1977-06-01), Yamashita

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