Focal length changeable lens system

Details Focal length changeable lens system Focal length changeable lens system

1995-04-11

1997-08-12

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359717, G02B 1514, G02B 1318

Patent

active

056571674

ABSTRACT:
A lens system comprises a stationary negative power singlet and a positive power singlet which is changed between two specific axial positions so as to yield a short focal length suitable for wide angle photography and a long focal length suitable for a tele-photography, respectively, and satisfies the following condition:

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patent: 5388006 (1995-02-01), Koelsch
patent: 5473473 (1995-12-01), Estelle et al.
patent: 5485314 (1996-01-01), Sato

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