Zoom lens

Details Zoom lens Zoom lens

1989-10-26

1990-05-15

Bovernick, Rodney B.

350432, G02B 1318

Patent

active

049252810

ABSTRACT:
Zooming optical systems in which the effective focal length changes required for changing image scale and focus maintenance are brought about by movement of various system elements across the optical axis rather than along it as is the usual case. The zooming systems are suitable for use in a variety of applications including visual instrumentation and photographic systems.

REFERENCES:
patent: 3305294 (1964-12-01), Alvarez
patent: 3583790 (1971-06-01), Baker
patent: 4457592 (1984-07-01), Baker
patent: 4650292 (1987-03-01), Baker et al.

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