Variable-focal-length objective and an optical system equipped w

Details Variable-focal-length objective and an optical system equipped w Variable-focal-length objective and an optical system equipped w

1980-07-25

1982-06-29

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Tilting

350427, 355 43, 355 57, G03B 2732, G03B 2752, G02B 900, G02B 1518

Patent

active

043369960

ABSTRACT:
A variable-focal-length objective for equipping optical printers and caption stands for the production of special effects on films is constituted by four groups of lenses, namely a first convergent group of four lenses, a second divergent group of four lenses, a third convergent group of six lenses, and a fourth convergent group of two lenses, the first and third groups being coupled together and movable.

REFERENCES:
patent: 3481666 (1969-12-01), Higuchi
patent: 3524696 (1970-08-01), Higuchi
patent: 4017161 (1977-04-01), Tsuji
patent: 4105291 (1978-08-01), Tsuji

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