Pentax X90 - Using Shutter Priority (Tv) Mode

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Taking Pictures
By changing the aperture, you can control the depth of the area that
appears in focus in the picture (the depth of field). By either narrowing
the focus to emphasize a single point or giving depth to your picture
instead you can completely change the feel of the picture you create.
Use the c (Aperture Priority) mode.
Opening the aperture (reduce the
aperture value)
Objects closer and farther than the focused
subject will be more out of focus. For instance,
if you take a picture of a flower against a
landscape with the aperture open, the
landscape in front and behind the flower will be blurred, emphasizing
only the flower.
Closing the aperture (increase the
aperture value)
The range in focus expands forward and
backward. For instance, if you take a picture of
a flower against a landscape with the aperture
narrowed, the landscape in front and behind
the flower will be in focus.
This mode automatically sets the shutter speed and aperture value to the
proper exposure according to Program Line. Use the e-dial to change
the shutter speed and aperture value while maintaining the proper
exposure.
1 Set the mode dial to e.
Effect of Aperture
To Use the e (Program) Mode