Pentax K10D Operating Manual page 161

Using the p (Bulb) Mode
This mode is useful for the long exposures required for shooting night
scenes and fireworks.
The shutter remains open as long as the shutter release button is kept pressed.
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Set the mode dial to p.
• Turn the rear e-dial to adjust the aperture value.
• Set the aperture value in increments of 1/2 EV or 1/3 EV. Set in [EV Steps] in
the [A Custom Setting] menu. (p.162)
• Use a sturdy tripod and the cable switch CS-205 (optional) to prevent camera
shake when using p (Bulb) mode. Connect the cable switch to the cable
switch terminal (p.17).
• Bulb shooting is available when using the remote control shooting mode
(p.81). The shutter remains open as long as the shutter release button of the
optional remote control is held down.
• Noise reduction is a process to reduce noise (image roughness or
unevenness) caused by low shutter speed. Set [Noise Reduction] in the
[A Custom Setting] menu. (p.34)
• When the sensitivity is set to [AUTO] and exposure mode is set to p (Bulb)
mode, the sensitivity is the lowest sensitivity set in "Setting the Range of
Automatic Correction in AUTO" (p.140).
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