Pentax K-5 Operating Manual page 122

Thissettingis useful w henshooting nightscenes andfireworks w hich
require longexposures.
I Set the mode dial to B.
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2
Press the shutter release button.
The shutter remains open as long as the shutter release button is kept
pressed.
The following functions are not available inB model ..................
EV Compensation
. Exposure Bracketing
- Continuous Shooting
-Interva! Shooting ...............................................................................
HDR Capture