Focusing method for a telephoto lens system

Details Focusing method for a telephoto lens system Focusing method for a telephoto lens system

1983-12-05

1985-12-17

Corbin, John K.

350450, G02B 964, G02B 1302

Patent

active

045589283

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 telephoto lens system being arranged to divide the intermediate lens group into two subunits and to focus the lens system by moving those subunits toward the image side by varying the distance between those subunits, the focusing method thereby enabling to attain focusing with satisfactorily favorable aberrations up to an object at a short distance.

REFERENCES:
patent: 3854797 (1974-12-01), Yokota
patent: 4437734 (1984-03-01), Iizuka

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