Mamiya 6MF, Instruction Manual

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[Setting the film speed] [Opening/closing the back cover] [Setting the film type]
While depressing the back cover lock but-
ton, simultaneously push down the lock
lever in the direction of the arrow and the
back will open.
When closing the back cover, securely
press both
corners until it clicks.
This camera can use either 120 or 220/135
film, To set the type of film used, simply
rotate the pressure plate in the direction of
the arrow until the white dot is at “120” or
“220/135”.
When set, “120” or "220/135" will appear in
the small window under the memo clip.