Abstract: A magnification change-over device for a camera is provided with an incident optical path for the incidence of the light of an object to be photographed; a first optical path for guiding the object light incident on the incident optical path to a first aperture; a second optical path for guiding the object light incident on the incident optical path to a second aperture; changeover means for selection between the first and second optical paths; and optical means for differentiating the magnification of an image formed through the second aperture from that of an image formed through the first aperture.

Abstract: A distance measuring device for a camera includes a first distance measuring arrangement adapted for measuring the distance of the middle part of a photographing field; a second distance measuring arrangement for measuring the distances of the middle and peripheral parts of the field; and a switch for selection between the first and second distance measuring arrangements.

Abstract: In a distance measuring device which has a semiconductor position sensor or the like employed as a light receiving element and which produces two different signals corresponding to the incident angles of a light coming from an object, the signals from the light receiving element are supplied, one after another, to a dual-slope type integrator such as a Miller integrator. A length of time required for reverse integration of the dual-slope type integrator is measured. Distance to the object is computed on the basis of the measured time.

Abstract: An input circuit which converts currents produced from a plurality of photo-sensitive elements arranged in a distance measuring apparatus. The input circuit has a switching element series connected to at least one of the photo-sensitive elements. When the switching element is operated, the output current of one of the photo-sensitive elements is supplied to a converting circuit which converts current into a voltage. Only one converting circuit is present. The output of the converting circuit is produced in a time series to a computing circuit. The computing circuit processes the signal thus received and produces a signal corresponding to an object distance.