Nikon D3100 2 manual Mode a Aperture-Priority Auto, Choose an aperture

Mode 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. Large apertures (low f-numbers) reduce depth of field, blurring objects behind and in front of the main subject. Small apertures (high f-numbers) increase depth of field, bringing out details in the background and foreground. Short field depths are generally used in portraits to blur background details, long field depths in landscape photographs to bring the foreground and background into focus.

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Large aperture (f/5.6) Small aperture (f/22)

To take photographs in aperture-priority auto:

1 Rotate the mode dial to A. Mode dial

2 Choose an aperture.
Aperture is shown in the viewfinder and
information display. Rotate the command
dial to choose the desired aperture from
values between the minimum and
maximum for the lens.	Command dial

3Frame a photograph, focus, and shoot.

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