Abstract: A microfilm camera uses an instant imaging film, such as a vesicular film. Simultaneously with the exposure of the film, a small blip is recorded along the length of the film. On readout, the camera may be set to count the number of blips and thereby stop a searching reader at a preselected frame. The invention is primarily directed to a circuit for controlling the recording of the microfilm images and the blips on such instant imaging or vesicular film.

Abstract: A microfilm camera using an instant image film, such as a vesicular film, is herein disclosed. Instant developing stations and an associated read-out optical system are positioned in the path followed by the film as it travels through the camera. After the film is developed, its image is projected through the optical system onto a display screen. This way the operator may see the images immediately after they are formed on the film and rephotograph any defective image immediately.

Abstract: An automatic focusing mechanism for adjusting the focus setting of the objective lens of an optical instrument such as a photographic camera. The adjustable focusing cell of the objective lens is coupled to a pivotal reception means so that the focus setting of the objective lens is maintained coincident with the distance between the camera and an object to be photographed when the longitudinal axis of the reception means is in alignment with a reflected light beam image transmitted from the camera to the object from an emission means spaced from the reception means. A rangefinder circuit controls the pivotal motion of the reception means so as to maintain its longitudinal axis in alignment with the reflected light beam image through variations in camera-to-object distance.