Focal length extender
AssigneePanavision, Inc.
InventorRobert E. Gottschalk
Life of this patent
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Abstract
An improved focal length extender of the anamorphic type is disclosed for use in combination with a conventional primary lens. The lens system of the present invention comprises two portions. A first portion is positioned in front of the conventional lens, and a second portion of the lens system of the present invention is placed between the conventional lens and the film plane. The first and second portions cooperate together and with the conventional lens system to provide increased focal length while at the same time providing relatively reduced mass and bulk at increased optical speed.
Claims1
A lens system having a front portion and a rear portion in which the rear portion is described by the following table:
- ______________________________________ Index Of SURFACE Radii Height Width Refraction Distance ______________________________________ 1 +.769 .786 1.000 1.620 .100 2 +2.571 .864 " .060 3 +1.176 .872 " 1.620 .100 4 +6.994 .976 " .200 5 +6.667 1.000 " 1.621 .120 6 +20.000 1.000 " 1.620 .120 7 +1.206 1.000 " ______________________________________
- and the front portion is described by the following table:
- ______________________________________ Index Of Di- Refrac- Dis- SURFACE Radii Width Height agonal tion tance ______________________________________ A -9.524 3.330 1.900 3.834 1.620 .620 B +7.143 3.434 2.102 4.026 1.621 .400 C PLANO 3.674 2.230 4.300 .250 D +17.551 3.772 2.364 4.450 1.621 .600 E +4.307 3.888 2.556 4.653 1.072 F +3.571 4.044 3.126 5.111 1.620 .500 G +18.845 4.636 3.286 5.682 .800 H +3.846 4.740 3.712 6.020 1.620 .600 I +8.431 5.946 3.906 7.114 ______________________________________
Dependencies are inferred from the claim text.