Reference Manual

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The functionality of the P+ back is well integrated with the
Mamiya 645AFD camera. The P+ back communicates with
the Mamiya camera through a fast internal electrical computer
interface. In addition adaptors are available for the Mamiya RZ
PRO IID.
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The Mamiya 645 AFD can be used with both Long and short
latency.
The P+ back is set to Short latency (default), which means that
the P+ back will respond fast however battery will drain quicker
than if it is set to Long Latency.
Normally battery lifetime is more than sufficient with the P+
backs, however to extend the time before the battery drains
you can set the P+ back to Long latency, and thereby preserve
battery life. Remember though that this will slow down the
response time when shooting.
To learn how to setup latency please consult the Menu mode
section