| 摘要 |
A single lens reflex camera having interchangeable lenses and an apparatus for determining the amount of exposure by measuring the light passing through the fully opened aperture of the lens, in which a diaphragm aperture is preset by setting a preset diaphragm aperture setting ring, having a graduated aperture scale of equal spacing, and the starting point of the movement stroke of the ring is set at a fixed position irrespective of the extent of the maximum aperture of an interchangeable lens, and thus the scale for the maximum aperture of the lens comes to the fixed position, which is characterized by an integral coupling member provided on the above-mentioned preset aperture setting ring or to a preset cam engaged with the ring, and at the same time a correction projection, having such a different length as to correct the apparatus referring to the maximum aperture of the interchangeable lens, is provided at the lens so that when the lens is mounted on a camera, the projection makes such correction as compensating for a drop in value in the light measurement with a full-open aperture by a large aperture lens. |
