1981-03-23
1984-04-17
Corbin, John K.
350432, 350480, 350481, G02B 904, G02B 906, G02B 1318, G02B 1502
Patent
active
044430671
ABSTRACT:
A zone focusing lens system is provided for use as a photographic camera objective. In the system, a fixed positive meniscus is placed ahead of the system aperture stop and is provided with an aspheric surface that is structured primarily to correct for off-axis aberrations. A lens disk having a plurality of different meniscus lens elements is located so that each of its elements can be selectively rotated into alignment proximate the system aperture stop to provide system focal lengths appropriate for sharply focusing objects located within different distance ranges. Each of the lens disk elements is provided with an aspheric surface that is structured primarily to reduce spherical aberrations.
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Owen, Jr. R. Calvin
Plummer William T.
Caufield Francis J.
Corbin John K.
Polaroid Corporation
Sugarman Scott J.
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