Mamiya 645 PRO TL - Manual (Page 28)

Using the Self-Timer/Delayed Shutter Release
To use the Self-Timer, set the Shut-
ter Release Selector to and press
the Shutter Release Button.
The Battery Check Lamp will light for
8 seconds and blink for 2 seconds,
whereupon the shutter will go off.
After using the self-timer mode,
be sure to return the Shutter Re-
lease Selector to the White Square.
(Normal mode.)
To override the self-timer, after
having pressed the release, move
the selector back to the white
square.
The Self-Timer can also be over-
ridden by inserting the Dark Slide
into the Film Holder or setting the
camera Shutter Speed Dial to “B”.
Please note:
If you want to use the self-timer
with the shutter speed dial set at
“A” or “AEL” and there is no AE
Finder attached to the camera, it
will not release the shutter even
though the light goes on for 10
seconds. However, when the dial
is set to manual speeds, the self-
timer will function.