| 摘要 |
A zoom lens system in which an angle of view is automatically varied according to camera-to-subject distances so as to be able to provide on a photographing screen a subject which is always constant in size. In the zoom lens system, a focus lens is stopped at a given position and, in this condition, a magnification varying lens and a compensator lens are driven to thereby achieve a focusing operation. In this operation, the angle of view is automatically varied according to the camera-to-subject distances, so that the size of the subject can be always constant with respect to the photographing screen regardless of the camera-to-subject distances. As a result of this, according to the invention, there is eliminated the need for provision of a data table memory for performing an automatic zooming operation, and exclusive and complicated control device and position detection device.
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