Mamiya 645 PRO TL - Manual (Page 30)

Mirror Lock-up Photography
To override the multiple expo-
sure mode or to return to normal
operation, be sure to return the
lever’s White Dot against the white
square and then advance the film.
(If you forget you will continue to
make multiple exposures on the
same frame.)
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 look-up Lever to the
yellow ”M.UP” square, after you have
composed and focused your picture.
This will raise the mirror and the
viewfinder image will be blacked out.
After use, return lever to normal (white
*When using the AE Prism
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 cannot
be obtained.
* When using a Leaf Shutter Lens,
be sure to read the instructions
accompanying it.
square) position.