Camera objective of variable focal length

Details Camera objective of variable focal length Camera objective of variable focal length

1978-06-23

1980-08-12

Clark, Conrad J.

G02B 1518

Patent

active

042170338

ABSTRACT:
A pancratic camera objective of varifocal ratio close to 5:1, and with a relative aperture varying between 1:1.2 in a wide-angle position and 1:1.5 in a telephoto position, has a pair of axially shiftable negative components bracketed by a pair of substantially fixed positive components. Its negative third component is more widely separated from its positive fourth component in the wide-angle position than in the telephoto position.

REFERENCES:
patent: 4087160 (1978-05-01), Besenmatter

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