Pentax 645N - Page 50

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Using the Bulb Exposure Mode
Purpose
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 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.
* Setthe 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 A 645 150mm f/3.5 or A 645 45 - 85mm Zoom
f/4.5 is attached.