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Mirror Up
When using mirror up with the Drive Dial in the M.UP position ensure
that the Exposure Mode Dial and the focus mode are both in Manual
mode (M).
It is not possible for the camera to measure light or focus when the
mirror is up.
Viewnder Masking
The image area of the Phase One and Mamiya 645 cameras is
approximately 56x42 mm. Viewnder masking is not necessary
for IQ280 and IQ260 models as their light sensitive CCD measures
53.9x40.4 mm.
Shutter Release Button
Drive Dial
Mirror*
*Do not touch the mirror
Exposure Mode Dial