Zoom objective

Details Zoom objective Zoom objective

1973-11-12

1976-09-14

Corbin, John K.

350255, G02B 1500, G02B 702

Patent

active

039803988

ABSTRACT:
A zoom lens assembly has a normal-range finder which is operable at all settings of a macro-range finder. The normal-range finder produces relative movement between two lens elements one of which is also positionable by the macro-range finder. This is achieved in one arrangement by controlling the positions of the lens elements with two coaxially arranged tubes which are coupled together for rotational movement but which can be moved axially with respect to one another by the macro-range finder. In another arrangement a single control tube is used to shift the two lens elements in response to adjustment of the normal-range finder but one of the lens elements is also displaceable within the control tube by rotation of a threaded mounting cylinder.

REFERENCES:
patent: 2026724 (1936-01-01), Wallensak
patent: 2080172 (1937-05-01), Fishe
patent: 3731987 (1973-05-01), Iida et al.

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