Wide angle lens with improved flat field characteristics

Details Wide angle lens with improved flat field characteristics Wide angle lens with improved flat field characteristics

1986-11-05

1988-09-20

Corbin, John K.

350412, 350479, G02B 900, G02B 300, G02B 904

Patent

active

047721073

ABSTRACT:
There is disclosed an improvement in wide angle lenses wherein very flat field characteristics are achieved. This is accomplished by a novel two element field flattener just before the image plane. One of the elements is positive and the other negative. It is possible to thereby correct both third and fifth order Petzval curvature, as well as third and fifth order distortion.

REFERENCES:
patent: 4001766 (1977-01-01), Hurwitz
patent: 4350411 (1982-09-01), Rogers
patent: 4411499 (1983-10-01), Abel et al.

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