Reference Manual

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T-mode is not supported for
digital backs on the Mamiya
645 AFD. This is usually not a
problem as the Mamiya can use
exposure times as long as 16
minutes.
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When using the Mamiya 645 AFD the mode selector should be
placed in M (Manual mode) and the focus type selector should
also be in the M position.
It is not possible for the camera to measure light or focus when
the mirror is up.
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