Zoom lens system

Details Zoom lens system Zoom lens system

1990-08-14

1993-03-16

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, 359700, 359705, G02B 1522

Patent

active

051949911

ABSTRACT:
A zoom lens system comprising a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power, and is modifiable into a macro optical system for photographing an object located at an exceptionally short distance with favorable optical performance by varying the airspaces reserved among the lens units in a manner different from that for zooming.

REFERENCES:
patent: 3884555 (1975-05-01), Suwa et al.
patent: 4348082 (1982-09-01), Ogawa
patent: 4576444 (1986-03-01), Kawamura
patent: 4786153 (1988-11-01), Ogata

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