Interchangeable-lens type TTL automatic exposure camera

Details Interchangeable-lens type TTL automatic exposure camera Interchangeable-lens type TTL automatic exposure camera

1978-06-14

1981-01-20

Hix, L. T.

354 46, 354 30, 354270, G03B 708, G03B 902

Patent

active

042459010

ABSTRACT:
Automatic exposure control is enhanced by providing a fixed diaphragm equivalent to the maximum aperture of the adjustable camera diaphragm so that the fixed diaphragm limits the maximum aperture to a consistent value. Consistent light measurements are possible as long as the lens being used does not interfere with the quantity of light entering the diaphragm.

REFERENCES:
patent: 2616342 (1952-11-01), Thompson
patent: 3552289 (1971-01-01), Fujimoto
patent: 3858224 (1974-12-01), Heaney
patent: 3962711 (1976-06-01), Cutler
patent: 3968504 (1976-07-01), Komine
patent: 3977012 (1976-08-01), Erlichman

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