Pentax K-m/K2000 Operating Manual page 100

98
Using a (Manual) Mode
You can set the shutter speed and aperture value. This mode is suitable
to take pictures of your choice by combining them. This mode is
convenient for taking pictures using the same combination of the shutter
speed and aperture settings or taking intentionally underexposed (darker)
or over-exposed (brighter) photographs.
1 Effect of Aperture and Shutter Speed (p.85)
1
Set the mode dial to a.
4
2
Turn the e-dial and adjust the
shutter speed.
3
Turn the e-dial while pressing
the mc button and adjust the
aperture.