Single-lens reflex camera with exposure meter

Claim 1

In a single lens reflex camera having a housing, the provision of an exposure meter arranged on the housing and including a photoelectric device for illumination by light passing through a detachable objective lens mounted on the housing, which objective lens includes a diaphragm presetting control, first indicating means arranged on the housing and influenced with regard to position by the photoelectric device in accordance with prevailing light conditions, a second indicating means movable within the housing by a first setting element provided on the objective lens, the position of which setting element being adjustable by movement of the diaphragm presetting control of the lens and a second setting element provided on the lens operatively connectable with one of the indicating means selected from the group consisting of said first and second indicating means, the position of which second setting element being arranged according to the maximum aperture of the attached lens and being effective to preset the exposure meter according to the maximum aperture of the lens by moving said selected indicating means whereby, alignment of the first indicating means and the second indicating means by means of the diaphragm presetting control of the lens presets the aperture to a value required for accurate exposure and in the event of an objective lens having a diaphragm control without presetting control and without setting elements being attached, the first and second indicating means attains a predetermined relative position which is capable of alteration by adjustment of the lens diaphragm aperture until the first indicating means is aligned with the second indicating means thereby providing an indication that the aperture is set to a value required for accurate exposure.