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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.
To take photographs in aperture-priority auto:
1 Rotate the mode dial to A.
2 Choose an aperture.
While the exposure meters are on, rotate the
sub-command dial to choose the desired
aperture from values between the minimum
and maximum for the lens.
3 Frame a photograph, focus, and shoot.
Large aperture (f/2.8) Small aperture (f/36)
A Non-CPU Lenses (0 270)
Use the lens aperture ring to adjust aperture.
If the maximum
aperture of the lens has been specified using the Non-CPU lens
data item in setup menu (0 159) when a non-CPU lens is attached,
the current f-number will be displayed in the viewfinder and
control panel, rounded to the nearest full stop.
Otherwise the
aperture displays will show only the number of stops (F, with
maximum aperture displayed as FA) and the f-number must be
read from the lens aperture ring.
Mode dial
Sub-command dial
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