Mamiya PRO 645 - Manual (Page 21)

Inserting the Roll Film Insert
Insert the loaded Roll Film Insert
into the holder, the film roll on top,
while squeezing on both sides of the
Release Latch (A) as shown in illus-
tration. Make sure that is been
properly seated and is locked in
place. Then close cover by firmly
pressing its top against the Roll Film
Holder.
* To close the Back Cover, firmly
press the top of the back cover on
both sides.
Film Speed (ISO) Dial
Each film holder has this important
feature. It electronically interfaces
the film holder with the AE Prism
Finder, the focal plane shutter and
the lens diaphragm, for exposure
automation.
This eliminates the need of having
to manually reset the meter, every
time you change film holders loaded
with different films. Therefore make
it a routine to always set this dial
with the speed of the loaded film.
The Memo Clip on the back of the
Roll Film Holder Cover accepts the
box top of the film carton and can
also be used for other reminders.