Mamiya PRO 645 - Manual (Page 30)

This is an important feature when
the tripod mounted camera is used
at slow or long exposure times and
particularly also with use of long
telephoto lenses. It eliminates the
possibility
of even the slightest “mir-
ror bounce ”which may affect image
sharpness.
Move the Mirror-up Lever to the
yellow "M.UP" square, after you have
composed and focused your pic-
ture. This will raise the mirror and
the viewfinder image will be blacked
out. After use, return lever to normal
(white square) position.
* W h e n u s i n g t h e A E P r i s m
Finder, set the Shutter Speed Dial
to “AEL”. Press the shutter re-
lease halfway and then lock the
mirror up. If set to “A” and the
mirror is locked up, “LT” (long
time) will appear in the finder dis-
play and correct exposure can-
not be obtained.
* When using a Leaf Shutter
Lens, be sure to read the instruc-
tions accompanying it.
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