Zoom lens

Details Zoom lens Zoom lens

1978-01-25

1979-05-08

Sacher, Paul A.

350176, 350189, 350207, G02B 1516

Patent

active

041533399

ABSTRACT:
In a zoom lens consisting of a first lens group having a negative refractive power and a second lens group having a positive refractive power with the air separation between the first and second groups being variable for zooming, there are provided two non-spherical surfaces positioned respectively in the first lens group and on the image side of a diaphragm in the second lens group at optional locations to prevent deterioration of aberrations which occurs when the image angle of the zoom lens is increased.

REFERENCES:
patent: 3848969 (1974-11-01), Tajima
patent: 3920315 (1975-11-01), Linke

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