Afocal optical device

Details Afocal optical device Afocal optical device

1980-08-05

1983-09-27

Corbin, John K.

350422, G02B 300, G02B 1502

Patent

active

044065248

ABSTRACT:
The afocal optical device is a removable accessory intended to be placed on an objective for taking pictures in the air as well as in water in order to reduce the focal length without modification of the focussing. In a preferred embodiment it comprises a frontal diverging group (G1) having two diverging lenses (A, B), and a positive rear group (G2) formed of two converging lenses (C, D).

REFERENCES:
patent: 3152209 (1964-10-01), Cox et al.
patent: 3319553 (1967-05-01), Vogel
patent: 4251127 (1981-02-01), Yamaguchi
SMPTE Journal, vol. 88, Apr. 1979, "The Bolex Aspheron: A Super-Wide-Angle Adapter", by J. Vasata, pp. 236 & 237.
"In-Water Photography-Theory and Practice", by Lawrence E. Mertens, pp. 154-158.

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