Automatic exposure means for photographic camera - controls exposure time in daylight and aperture according to focussing for slash

摘要

A camera is operated with manual setting of the aperture for normal photography, while the exposure time is controlled by a photoelectric cell which also controls a meter which indicates the exposure time in the viewfinder. Manipulation of a ring on the lens tube transfers the operation to flash photography. In usual flash photography a variable resistor adjusted by the focussing of the lens determines the position of the meter movement, which both shows the indication of the aperture in the viewfinder and controls the aperture setting. Where an appreciable amount of daylight is to be taken account of, the shutter timing, instead of being fixed is controlled by a light measurement, although the aperture is controlled by the focus distance.