Leica S-ADAPTER H Manual De Instrucciones página 19

D. use of the central shutter on a hasselblad hc/hcD lens
If
a. the main switch on the camera is set to CS, and
b, a shutter speed in the range 11s to 1/750s is set, the
central shutter on these lenses is used. Faster or slower
shutter speeds are covered by the focal plane shutter in
the camera - regardless of the main switch setting.
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