Pentax SLR Operating Manual page 140

138
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 a
convenient for taking pictures using the same shutter speed and aperture
setting combination or taking intentionally under-exposed (darker) or over-
exposed (brighter) photographs.
1 Effect of Aperture and Shutter Speed (p.127)
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.