Pentax K10D Operating Manual page 156

154
Using the L (Shutter & Aperture Priority) Mode
You can set both the desired shutter speed and aperture to take the
picture.
Automatically sets the sensitivity so that shutter speed and aperture will
give the proper exposure according to the brightness of the subject.
1
Set the mode dial to TAv.
4
2
Turn the front e-dial and adjust
the shutter speed.
3
Turn the rear e-dial and adjust
the aperture value.
The shutter speed, aperture value and
sensitivity are displayed in the
viewfinder and on the LCD panel.