Zoom lens bearing camera

Details Zoom lens bearing camera Zoom lens bearing camera

1993-01-13

1994-05-10

Adams, Russell E.

354413, 3541951, G03B 1336

Patent

active

053112385

ABSTRACT:
A zoom lens bearing camera comprises a zoom lens having a full-aperture F number which changes as a zoom focal length is changed, the zoom focal length being controllable to a desired value through electrical driving, a ranging unit for measuring a distance to a subject, a metering unit for measuring brightness of a scene containing the subject, an electronic flash unit for supplying as an auxiliary light source to the subject, a sensitivity detecting unit for detecting a film exposure sensitivity, a first data table in which optimum zoom focal lengths respectively corresponding to various subject distances are set, a second data table in which optimum zoom focal lenghts respectively corresponding to the various subject distances are set according to a range of the electronic flash, and a zoom focal length determining unit for determining the zoom focal length corresponding to the distance to the subject by selecting the first data table when a quantity of exposure obtained based upon the brightness of the scene measured by the metering unit, the film exposure sensitivity detected by the sensitivity detecting unit, and a full-aperture F number in a selected zoom focal length is not less than a setting value, while selecting the second data table when the quantity of exposure is less than the setting value.

REFERENCES:
patent: 4878080 (1989-10-01), Takehana et al.
patent: 4896177 (1990-01-01), Kazami et al.
patent: 5070352 (1991-12-01), Kotani et al.
patent: 5089841 (1992-02-01), Yamada
patent: 5132718 (1992-07-01), Fujino et al.
patent: 5227831 (1993-07-01), Miyazaki et al.

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