Camera system with automatic focusing device and motorized zoom.

A camera system having a powered zoom lens (51) and an autofocus device comprising: a zoom motor (65) for effecting the zooming of the powered zoom lens (51); a focal length detecting device for detecting a focal length of the powered zoom lens (51); an object distance sensing device for detecting the distance of an object that is in focus; and a computing device for calculating an image magnification as a function of the focal distance and object distance detected, respectively, by the focal length detecting device and the object distance detecting device, and then calculating a target focal distance at which the image magnification is kept constant, as a function of the object distance detected by the object distance detecting device.