Automatic exposure control apparatus and method for electronic still camera
 A pre-measurement of the subject brightness is performed with a preset aperture value and a preset shutter speed, and a main measurement is performed with a combination of an aperture value and a shutter speed that are determined based on the result of the pre-measurement in accordance with a program for the main measurement, wherein the aperture value is selected from among a relatively small number of predetermined aperture values. Thereafter, a combination of an aperture value and a shutter speed for photographing is determined based on the result of the main measurement in accordance with another program, wherein the aperture value is selected among a larger number of predetermined aperture values, so that the number of changing aperture value and thus the time lag are remarkably reduced while achieving an accurate exposure control. 
Fuji Photo Film Co., Ltd.
H
H04N
inventional
Fumihito Yoshihiko
Arai Mori