| 摘要 |
An exposure meter system for a single-lens reflex camera which can function either by sensing the light passing through the maximum diaphragm opening of an interchangeable lens mounted on the camera or by sensing the light which has been restricted by the diaphragm of the interchangeable lens. Light from the interchangeable lens is directed through a relay optical system to a photocell. An adjustable aperture in the relay optical system is adapted to be connected to the diaphragm ring of the interchangeable lens to adjust the sensitivity of the photocell for different aperture ratios of different interchangeable lenses. When the adjustable aperture in the relay optical system is not connected, compensating means associated with the photocell are automatically actuated to enable the exposure meter system to operate by using the diaphragm of the interchangeable lens to control the light reaching the photocell.
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