User's Guide

SETTINGS
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8686
TRUE EXPOSURE EXPLAINED
True Exposure is an XCD and HC/HCD lens function that
allows the effective shutter speed to remain unaffected when
stopping down. This effect is perhaps not so commonly
understoodasitisrestrictedspecicallytointegrallens
shutters as opposed to focal plane shutters.
When a lens is stopped down, the effective shutter speed
becomes longer, consequently affecting the set exposure. At
slow shutter speeds the effect is minimal but at faster speeds,
e.g. 1/500s, the effect becomes clearly visible. Automatic
compensatory measures in speed setting adjustments are
employed.
As compensation can only be put into effect where speeds
can be adjusted, this prevents the possibility of adjusting the
fastest speed. To counter this, compensatory adjustments
are therefore made to the aperture instead to retain the set
exposure. This compensation is not always required and when
usingash/strobeasthemainlightsourceitisactuallyunde-
sirable because compensation will result in underexposure.
Therefore,whenusingash/strobeasthemainlightsource,
you should set True Exposure to OFF in Main Menu > Camera
Settings > Exposure > True Exposure in the Camera Display.
You can download a complete explanation of this situation
at www.hasselblad.com.
Time
Light level at
image plane
Maximum aperture
Stopped down one stop
with True Exposure ON
Stopped down one stop
with True Exposure OFF
T fully open
T stopped down = T Fully open
T stopped down > T Fully open
(Using True Exposure)
(Without True Exposure)
907X Special Edition USER GUIDE