Copying lens system

Details Copying lens system Copying lens system

1979-12-03

1981-08-25

Corbin, John K.

G02B 936

Patent

active

042855799

ABSTRACT:
A copying lens system having four lenses disposed symmetrically about a diaphragm is characterized in that it has an F-number of 5 to 6, has a half angle of view of 15.degree. to 18.degree. and is good in spherical aberration, field curvature and astigmatic difference.

REFERENCES:
patent: 2405729 (1946-08-01), Altman
patent: 3731990 (1973-05-01), Van Orden

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