AUTOMATIC VARIABLE POWER DEVICE FOR ZOOM LENS OF CAMERA

PURPOSE:To obtain an adequate zoom ratio always in correspondence to a photographer's photographing will by making judgement as to whether outdoor photographing or indoor photographing in addition to the size and position of the subject within the photographing angle of view and varying the power of the lens to the optimum zoom ratio. CONSTITUTION:The variable power program which sets the focal length of the zoom lens at the values suitable for outdoor photographing in accordance with the distances to objects is provided in a microcomputer 15. A 1st data table which sets plural pieces in correspondence to the sizes of the objects occupying within the photographing angle of view and a 2nd data table which sets at the values suitable for the indoor photographing are provided. The 1st data table is selected if the photographing state is the outdoor photographing in accordance with the result of decision by a photographing state deciding means. The 2nd data table is selected in the case of the indoor photographing. The adequate zoom ratio corresponding to the photographer's photographing will or the photographing state is obtd. in this way.