Wide angle lens with improved flat field characteristics
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United States of America Patent
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Sep 20, 1988
Grant Date -
N/A
app pub date -
Nov 5, 1986
filing date -
Nov 5, 1986
priority date (Note) -
Expired
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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.
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