The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2007
Filed:
Mar. 02, 2005
James Brian Caldwell, Petersburg, VA (US);
Terry Lee Zarnowski, Homer, NY (US);
James Brian Caldwell, Petersburg, VA (US);
Terry Lee Zarnowski, Homer, NY (US);
Panavision International, L.P., Woodland Hills, CA (US);
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.