Patent
1978-04-24
1980-03-04
Gonzales, John
354 25, 354196, G03B 304, G03B 1503
Patent
active
041914627
ABSTRACT:
An improved lens arrangement is provided for use in a camera of the type having a focal plane and a subject-to-camera distance responsive effective maximum aperture limiting control arrangement operatively disposed with respect to the focal plane. The improved lens arrangement has a reverse spherical aberration corrective characteristic which operates to reduce the effective circles of confusion associated with each of the images of different subjects within a given range of distances from the camera as formed at the focal plane by the lens arrangement in combination with the effective aperture control arrangement.
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Cox, A. Optics-The Technique of Definition, Focal Press, London & N.Y., 11th Ed., 1956, pp. 66 & 103-106.
U.S. Patent Application Ser. No. 839,839, "Sonar Controlled Two Focal Position Lens System", by B. Johnson, filed 10/6/77.
Gonzales John
Polaroid Corporation
Roman Edward S.
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