Hasselblad X1D-50c User Manual page 95

Settings
True Exposure explained
Light level at image plane
True Exposure is an XCD and HC/HCD lens function that allows
the shutter speed to remain unaffected when stopping down.
This effect is perhaps not so commonly understood as it is
restricted specifically 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, 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 of 1/800s. To counter this, compensatory adjustments
X1D
T fully open
T stopped down = T Fully open
(using True Exposure)
T stopped down > T Fully open
(without True Exposure)
Table of Content
Maximum aperture
Stopped down one stop with True Exposure ON
Stopped down one stop with True Exposure OFF
are therefore made to the aperture instead to retain the set
exposure. This compensation is not always required and
when using flash/strobe as the main light source it is actually
undesirable because compensation will result in underexposure.
Therefore, when using flash/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 from
www.hasselblad.com.
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