Using The Av (Aperture-Priority) Mode - Pentax w Operating Manual

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Using the Av (Aperture-priority) mode

The shutter speed is automatically set by the camera for a proper
exposure to match the brightness of the subject when the aperture value
is selected. This mode is ideal for shooting landscapes with increased
depth of field, or a portrait against a blurred background. See page 136 for
the effect of aperture.
1
Set the mode dial to c.
4
2
Select the aperture value with
the Av dial.
3
Confirm the shutter speed and
aperture value in the
viewfinder or on the LCD panel.