Zoom lens system

Details Zoom lens system Zoom lens system

1990-11-26

1992-03-10

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1700

Patent

active

050953885

ABSTRACT:
A zoom lens system permitting photographing at definite magnification levels comprising a first lens unit and a second lens unit, and equipped with a first mechanism for varying f and .beta. so as to keep f/.beta. nearly constant and a second mechanism for varying, independently of the first mechanism, the airspace between the first lens unit and the second lens unit when the reference symbol f represents total focal length of the first lens unit and the reference symbol .beta. designates total lateral magnification of the second lens unit. Said zoom lens system is equipped with simple mechanisms and permits photographing objects located at distances within a broad range at optional magnification levels within a certain range.

REFERENCES:
patent: 4193667 (1980-03-01), Yasukuni et al.

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