Telephoto lens system having an improved focusing arrangement

Details Telephoto lens system having an improved focusing arrangement Telephoto lens system having an improved focusing arrangement

1984-02-03

1986-09-02

Corbin, John K.

G02B 1302

Patent

active

046092633

ABSTRACT:
A focusing method for a telephoto lens system comprising a front lens group having positive refractive power, an intermediate lens group having negative refractive power, and a rear lens group having positive refractive power, the focusing method for a telephoto lens system being arranged to focus the telephoto lens system by moving the intermediate lens group toward the image side and the rear lens group toward the object side.

REFERENCES:
patent: 3854797 (1974-12-01), Yokota
patent: 4240699 (1980-12-01), Sato et al.
patent: 4457595 (1983-07-01), Mihara

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