Pentax K-7 Operating Manual page 109

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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 overexposed (brighter)photographs.
r-_ Effect of Aperture and Shutter Speed (p.88)
I Set the mode dial to M.
2
Press the (_ (Green) button.
Automatically switches shutter speed and
aperture to the proper exposure.
3
Turn the front e-dial (,,'_,,) to
adjust the shutter speed.
The shutter speed can be set within the
range of 1/8000 to 30 seconds.