Mamiya 645 PRO TL - Manual (Page 23)

Shutter Speed Settings
3. Wind up. How to set the Shutter Speed Dial
Wind up the crank handle until it 1. Set the desired shutter speed
stops. In the film counter window, the against the white index line (A) on the
number 1 appears, and the film and shutter speed dial.
shutter are set. 2. At the red “A" (for Automatic) and
AEL (for Automatic Lock) settings,
the shutter speed dial is locked
between these two positions. These
settings will only function if an AE
Finder is mounted on the camera. To
release this lock push button (B) while
turning dial.
3. All while numbers are fractional
seconds. (i.e. 30 =1/30 sec).
The yellow 2 and 4 are full seconds.
“B” (shutter stays open as long as it
is depressed) is also yellow.
4. Red 60 is 1/60 sec. It is colored red
to remind you that it is the fastest
speed useable with electronic flash.
5. Note: When a Metz Electronic Flash
Unit, together with SCA 396 module,
is attached to the camera, the camera
sets itself automatically to 1/60 sec.,
irrespective of the dial setting.
When manually selected shutter
speeds are set on the shutter speed
dial, the intermediate shutter
speeds available in the AE
operation are not obtainable.