Small-Format Cameras, ContinuedFilm releaseThe film-release button, located on the bottom of camera bodies, releases thetension on the film roll winding inside the camera body. Make sure youdepress the film release before attempting to rewind film into the canister orpreparing a double exposure. Not releasing tension on the film will tear filmand sprocket holes. The film release does not open the film back or exposefilm.Light metersA light meter inside the camera body reads the amount of light entering thelens and recommends an overall ideal aperture setting. Most 35mm SLRshave built-in light meters that read through the lens (TTL). Light metersmay read light falling on the mirror, the shutter curtain, the focusing screen,or the film surface and produce a display in the viewfinder indicating thecorrect exposure setting. In the manual mode, set the lens aperture tocorrespond with the meter reading. In the automatic mode, the camera setsthe exposure and informs you of the setting. To compensate for unusuallighting conditions or for creative effect, override the automatic selection andmanually set the aperture. Light meters in 35mm cameras are ordinarilypowered by batteries.Figure 7-13 shows a light meter reading from the eyepiece of a camera.Figure 7-13.—A TTL light meter reading of f/8 fromthe eyepiece of a camera.Continued on next page7-20
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