Periscopic viewfinder

Details Periscopic viewfinder Periscopic viewfinder

1987-08-20

1989-02-21

Corbin, John K.

350432, 350573, G02B 1314, G02B 1318, G02B 2300

Patent

active

048059714

ABSTRACT:
An improved periscopic viewfinder for use following an afocal zoom section in a still electronic imaging camera. The viewfinder features an infrared detector for sensing scene intensity to provide strobe quenching information, visual displays, and a relay section comprising a symmetrical pair of new achromats for aberration control and field flattening purposes.

REFERENCES:
patent: 3583785 (1971-06-01), Boardman
patent: 3722979 (1973-03-01), Mikami
patent: 3792650 (1974-02-01), Mueller et al.
patent: 4270837 (1981-06-01), Baker
patent: 4545652 (1985-10-01), Hoogland
patent: 4575195 (1986-03-01), Hoogland
patent: 4621888 (1986-11-01), Crossland et al.
Lens Design Fundamentals by Rudolf Kingslake, Academic Press, New York, San Francisco, London 1978, excerpt pp. 195-196.

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