| 摘要 |
<p>PURPOSE:To make a camera compact without any degradation in focusing accuracy by perform automatic focusing operation with a TTL system and constituting the finder system of an external light system. CONSTITUTION:The positive front group 25 and negative rear group 26 of a two-group zoom lens move forth and back in the direction of the optical axis at different speeds and the focusing operation is performed by the front group lens 25. The objective 27 of a real image type finder moves its negative lens and positive lens forward and backward in the optical-axis direction at the different speeds to vary the magnification by the positive lens and adjust the diopter by the negative lens, thus performing zooming operation. A photometric lens 30 and a photometric element 31 are used for photometry operation. Thus, the finder system and a photometry instrument are composed of the external light system without passing through a photographic lens system and the automatic focusing operation is performed by the TTL system which finds the range to an object by a range finding means with light passing through the photographic lens system. Consequently, the focus is accurately adjusted and the camera can be made compact.</p> |
