Abstract: A sub-miniature camera has a rotatable winding knob which moves the film and cocks the shutter of the objective. A slide is movable by the knob between initial and end positions and blocks a release button from actuation when the slide is in its initial position and releases the button when the slide is in its end position. The slide is provided with a slot through which passes a rod of the release button and the slot and rod co-act to block and unblock the release button. The shutter is operated electrically by contact means closed by the slide moving to its initial position. The slide also actuates an exposure counter and the exposure counter is returnable to the zero counting position upon opening of the camera housing.