Abstract: An auto-focus single-lens reflex camera in which manual focusing can be conducted using a manual focusing member provided on the focusing lens (7), in addition to the switching over of the operation mode between auto-focusing and manual focusing, by providing means for judging whether the amount of shift of the position of a point at which the image of the subject is formed is within a focused range, the amount of shift being detected in the camera body in the auto-focusing mode, and by engaging a normally disengaged lens side drive means (2,3,4,5) and camera side autofocus drive means (8,9,10,11,13) through a clutch member (14) controlled by the judging means, with the autofocus drive means being engaged with the lens drive means only when it is necessary to drive the autofocus motor, a compression spring (12) normally disengaging the camera side drive means from the lens side drive means until the clutch is enabled to overcome the resilient force.

Abstract: A microprocessor (CPU) controlled autofocus single-lens reflex camera having an interchangeable lens displays the subject distance (3) and the corresponding subject vertical and horizontal dimensions (1,2) in the camera viewfinder adjacent to the in-focus picture (4) which normally appears in the viewfinder by calculating data obtained by a subject distance detecting means and by a focal distance detecting means for detecting the lens focal distance which is used to determine the field angle. The relationship in size between the normal camera picture size and the subject (4) are calculated to provide the corresponding subject dimensions which are displayed in the viewfinder (1,2,3).