Pentax K100 D Operating Manual page 146

144
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 shutter speed and aperture
setting combination or taking intentionally underexposed (darker) or over-
exposed (brighter) photographs.
1 Effect of Aperture and Shutter Speed (p.134)
1
Set the mode dial to a.
5
2
Turn the e-dial and adjust the
shutter speed.
3
Turn the e-dial while pressing
the mc button and adjust the
aperture.