Nikon D300 D300 User's Manual - Page 133
A: Aperture-Priority Auto, Select exposure, Choose an aperture.
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g: 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. To take photographs in aperture-priority auto: 1 Select exposure mode g. I button Press the I button and rotate the main command dial until g is displayed in the viewfinder and control panel. Main command dial 2 Choose an aperture. Z Rotate the subcommand dial to choose the desired aperture from values between the minimum Sub-command dial and maximum for the lens. Small apertures (high f-numbers) increase depth of field (see page 103), bringing both foreground and background into focus. Large apertures (low f-numbers) soften background details in portraits or other compositions that emphasize the main subject. Small aperture (f/36) Large aperture (f/2.8) 107