Nikon D100 Product Manual - Page 93
A: Aperture-Priority Auto
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Taking Photographs-Exposure Controlling How the Camera Sets Exposure A: Aperture-Priority Auto In aperture-priority auto, you choose the aperture while the camera automatically selects the shutter speed that will produce the optimal exposure. Small apertures (high f/-numbers) increase depth of field, bringing both the main subject and background into focus. Large apertures (low f/-numbers) soften background details and let more light into the camera, increasing the range of the flash and making photographs less susceptible to blurring. Aperture-priority auto is only available with CPU lenses. To take photographs in aperture-priority auto: 1 Rotate the function dial to A. 2 Rotate the sub-command dial to choose the desired aperture. The minimum and maximum values for aperture are determined by the lens currently in use. 3 Frame a photograph and shoot. Exposure Warning If the camera is unable to produce the correct exposure at the selected aperture, the electronic analog exposure display ( 83) in the viewfinder will show the amount of under- or over-exposure and one of the following indicators will be displayed in the control panel and viewfinder shutter-speed displays: Indicator Description Subject too bright. Choose smaller aperture (larger f/-number), lower sensitivity (ISO equivalency), or use Neutral Density (ND) filter. Subject too dark. Choose larger aperture (smaller f/-number), raise sensitivity (ISO equivalency), or use flash ( 98). 81