| 摘要 |
Attachment devices for automatic focusing cameras which permit the taking of exposures having a visual field different from that attainable with the fixed photographic lens of the camera comprise a conversion lens of different focal length, e.g., wide angle or telephoto, than the camera lens adapted to mount on the front of the camera lens, and refraction means to compensate the automatic movement of the camera lens for the mounting of such conversion lens including a prism to mount on the camera to cover a window on the camera through which light passes to control automatic focusing of the camera lens, such prism being structured to change the path of light passing through the window by a angle D that corresponds to the required alteration in the range of movement of the camera lens when the conversion lens is mounted on the camera.
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