Mamiya PRO 645 - Manual (Page 17)

For normal operation set the White
Dot of the Shutter Release Selector
(A) against the White Square Dot
When set to the Red Dot the
Release Button is locked.
Select this mode if the camera
will be idle for a period and to
prevent accidental shutter re-
lease. Also when the Power Drive
Grip is used.
When set to the yellow clock symbol
the self-timer is operative. See
page 27 and 28 for further instruc-
tions.
Operating the shutter Release
Button
1. The Shutter Release Button
functions in two steps. Gentle pres-
sure will light the metering informa-
tion display if the AE Prism Finder is
used. Continued pressure will re-
lease the electromagnetic shutter.
2. If the film is not completely ad-
vanced, if the Dark Slide is not with-
drawn or if the battery is dead, the
shutter will not function, even when
the Shutter Release Button is
pressed. This will also be the case if
the Shutter Speed Dial is set to “A”
or “AEL” when the AE Prism Finder
is not attached.
3. After releasing the shutter, the
Film Advance Crank will
cally unlock and be ready to advance
the film.
16