Pentax 645N2 - Manual (Page 52)

50
ADV
ANCED OPERA
TIONS
1 2 3
Using the Bulb Exposure Mode
Purpose
This mode is useful for the long exposures required
for shooting night scenes and fireworks. The shut-
ter remains open as long as the shutter release but-
ton is held down.
How to
1. Set the lens aperture ring to the desired f-stop
other than [ A ] while holding down the aper-
ture-A lock button.
• Do not set the lens aperture ring to [ A ]. If doing
so, the aperture will always closed to the maxi-
mum position.
2. Set the shutter speed dial to [ B ].
3. An appropriate aperture will be displayed in
the viewfinder when the shutter release but-
ton is depressed halfway.
• Set the shutter speed dial to the [ B ] position. Turn
the shutter speed dial while holding down the
shutter speed dial lock button.
• The approximate aperture indication appears in
the viewfinder. It may not the same indication as
you select the lens aperture ring especially when
the A645 150mm f/3.5 or A 645 45-85mm Zoom
f/4.5 is attached.
22 16 8 4 22 16 8 4
f
1 0 1 5
A 22 16 11 8 5.6