Zoom lens system

Details Zoom lens system Zoom lens system

1991-02-27

1992-12-15

Hannaher, Constantine

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1518

Patent

active

051722739

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a positive or negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a negative refractive power, adapted so as to perform variation of focal length by moving said lens units along the optical axis, and adapted so as to perform focusing by moving at least one of the lens units other than said first lens unit. This zoom lens system can be focused on an object located at a very short distance.

REFERENCES:
patent: 4701033 (1987-10-01), Masumoto
patent: 4787719 (1988-11-01), Imai
patent: 4840468 (1989-06-01), Tanaka
patent: 4963006 (1990-10-01), Inadome

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