Hasselblad 645 - Manual (Page 78)

Configuring Your Camera
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Long Exposure
The Long Exposure property reduces
accumulated pattern noise in long exposure
images.
Long Exposure Processing is applied
immediately after image capture. As a result,
there is a greater lag time between exposures,
thereby reducing "burst" mode capture rate and
depth. This is true even when the property is set
to "Exposures >1/4 sec." and a shutter speed
shorter than 1/4 sec. is used. For example, if you
are capturing an image using a 10 second
shutter speed, there will be 10 seconds of
processing immediately after image capture.
1 Display the Properties menu (page 76) .
2 Select Long Exposure.
3 Choose one of the following:
Never Apply—Long Exposure processing is
not applied to any image, regardless of shutter
speed.
Exposures >1/4 sec.—Long Exposure
processing is applied to images taken with
shutter speeds longer than 1/4 second.
All Exposures—Long Exposure processing is
applied to all images after capture, regardless
of shutter speed. If you are using the long
exposure function, allow time between
exposures to allow the CCD to cool.