Abstract: A camera having a motor-driven zoom lens includes power zoom mode in which a zoom motor is rotated in a forward and reverse direction by a telephoto switch and a wide angle switch. A plurality of control zoom modes is provided in which the zoom motor is driven in modes different from the power zoom mode. A single changing switch selectively occupies three positions: a power zoom position in which the power zoom mode is performed; a mode selection position in which one specific mode can be selected from among the control zoom modes; and, a control zoom position in which the control zoom is performed at the selected control zoom mode.

Abstract: A motor-driven zoom lens barrel including a zoom motor, a powered zooming mechanism which varies the focal length of a taking lens in accordance with the rotation of the zoom motor in the forward and reverse directions, a zoom operation ring which can be rotated, a rotational direction control circuit for rotating the zoom motor in the forward and reverse directions in accordance with the rotation of the zoom operation ring in the forward and reverse directions from a neutral position thereof, and a speed control circuit for controlling the rotational speed of the zoom motor in accordance with the angular displacement of the zoom operation ring from the neutral position.