Pentax K20D User Manual page 88

Using the b (Shutter Priority) Mode
Lets you set the desired shutter speed for expressing moving subjects.
When taking pictures of a fast moving subject, you can increase the
shutter speed to make the subject look still or decrease the shutter speed
to have the subject show movement.
Aperture value is automatically set to give the appropriate exposure
depending on the shutter speed.
1Effect of Aperture and Shutter Speed (p.76)
1
Set the mode dial to b.
2
Turn the front e-dial and adjust
the shutter speed.
The shutter speed and aperture value
are displayed in the viewfinder and on the
LCD panel.
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