| 摘要 |
In a photographic cassette camera having a cassette guide frame and an attachable ground-glass frame supporting a ground-glass for observation of a subject to be photographed, one of the grames defining an image field of the camera, a rear wall construction of the camera wherein the cassette guide frame has a support frame surrounded by lateral guide surfaces, the ground-glass frame having support runners which fit against the support frame in the guide surfaces for mounting the ground-glass parallel to the support frame, a bar-shaped exposure measuring probe having at one end an opto-electric transducer and being mounted on a holding device on one of the frames for sliding and pivotal movement adjacent one of the lateral support elements of the cassette guide frame, such one element and one of the adjacent support runners having recesses therein permitting movement of the probe between a selectively adjustable measuring position within the field on a front side of the ground-glass and a rest position completely out of the image field, the probe having a dimension perpendicular to the support plane which exceeds the ground-glass focal distance, and the probe engaging the recesses whenever it is adjusted for a measuring position. |
