Reference Manual

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The CONTAX 645 utilizes a TTL phase difference detection
type auto focus system. Furthermore the CONTAX 645 provides
auto exposure settings. The CONTAX 645 with a P+ back
encourages all kinds of photographic uses from portraiture and
wide-angle photography to high speed shooting to capture fast
action with telephoto lenses.
The functionality of the P+ back is well integrated with the
CONTAX 645 camera. The P+ back communicates with the
CONTAX camera through a fast internal electrical computer
interface.
This exciting P+ back solution is a result of a development
project fully supported by Kyocera.
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The CONTAX 645 can work in different auto exposure modes.
This is fully supported by the P+ back, which communicates the
equivalent film speed of the digital back to the CONTAX 645
camera.
When capturing with auto exposure modes, exposure times
between 1/4000 sec. and 32 sec. can be obtained. Please
note that images captured with exposure times longer than
60 sec. can be degraded because of increased digital noise
also depending on the ISO setting. The auto exposure of the
CONTAX 645 camera uses the ISO value set in the P+ back, or
when shooting tethered, in the Capture One application. The
ISO can be set to 50, 100, 200 400 or even 800.