Exposure controlling system and interchangeable lens therefor

Details Exposure controlling system and interchangeable lens therefor Exposure controlling system and interchangeable lens therefor

1989-03-20

1989-10-31

Adams, Russell E.

354441, 354455, 35428912, G03B 1717, G03B 720

Patent

active

048780766

ABSTRACT:
An exposure controlling system wherein functional restrictions are little even when a cata-dioptric lens is mounted as an interchangeable lens and also provide an interchangeable lens for such an exposure controlling system. The exposure controlling system comprises means for reading data regarding aperture values of an interchangeable lens from the lens, and a light measuring means. In response to outputs of the two means, a display means displays, when the lens is an ordinary lens, a combination of an aperture value and an exposure time to which the ordinary lens can be controlled to provide an appropriate exposure, and when the lens is a cata-dioptric lens, a fixed aperture value and an exposure time for the fixed aperture value of the cata-dioptric lens which time provides an appropriate exposure. A cata-dioptric lens as the interchangeable lens comprises means for receiving a reading instruction signal from a camera body, and means for successively forwarding data peculiar to the cata-dioptric lens to the body in response to the reading instruction signal. The data include data regarding a fully open aperture value and data regarding a maximum aperture value, and the two values are equal to each other.

REFERENCES:
patent: 4256372 (1981-03-01), Yasuauni et al.
patent: 4437746 (1984-03-01), Ikemuri
patent: 4509846 (1985-04-01), Nakai et al.
patent: 4734730 (1988-03-01), Ootsuka et al.
'87 Japan Camera Show, "MF Sigma Mirror 600", vol. 88, p. 69.

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