Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-10-16
2007-10-16
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
11071125
ABSTRACT:
A compact zoom lens system providing a wide-range, ultra-wide angle optionally rotatable compound zoom is disclosed. In one embodiment, the optical design is comprised of an NPP kernel followed by a PP relay with four independently moving groups, two on each side of an intermediate image. The front group is stationary with respect to the image plane, as are two fold prisms. The kernel has a zoom ratio of about 2:1, and the zoom relay has a magnification ratio of about 4:1, giving a total zoom ratio of about 8.6:1. The PP relay is comprised of two independently moving positive groups. The focal lengths covered by the zoom range have a 35 mm still camera equivalent of about 21 mm to 180 mm. The aperture of the system ranges from about f/2.8 to f/6.3, but is constant at about f/2.8 from about 3 mm through 6.2 mm focal length.
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Caldwell James Brian
Zarnowski Terry Lee
Morrison & Foerster / LLP
Panavision International L.P.
Schwartz Jordan M.
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