Mamiya PRO 645 - Manual (Page 23)

4. “A and “AEL” explained
“A (auto exposure) and “AEL” (auto
exposure lock) setting must only be
used when the AE Prism Finder is
attached to camera.
1. If it is not attached and the dial is
set to either of these positions, the
shutter release will not work.
2. If it is not attached and the Self-
Timer is activated, the Pilot Lamp
will Iight for 10 seconds but the shut-
ter will again not release.
If the Shutter Speed Dial is set be-
tween click stops either the higher or
lower exposure speed may result.
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