Hasselblad H6D, Руководство пользователя

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True Exposure explained
True Exposure is an 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,
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 of 1/800s. 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 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 Sensor Unit
Display.
You can download a complete explanation of this situation from
www.hasselblad.com.