Hasselblad 500C/M Instruction Manual page 21

After the final exposure
The camera's release mechanism is automati-
cally blocked when the final frame has been
exposed. Fold out the magazine's film wind-
ing crank and wind the remaining film onto
the take-up spool.
Miscellaneous (Figs. 42—43)
The magazine's film winding crank (23) is
blocked only at frame '1'. So a partially ex-
posed roll of film can be wound onto the take-
up spool at any time.
The frame counter is automatically reset
whenever the roll holder key is removed.
The center of the roll holder key (42) features
a film consumption indicator (43) which is
blank when the magazine has a full load on
the supply spool. But the indicator gradually
turns red as the film is exposed and advanced
onto the take-up spool. A completely red in-
dicator shows that the final frame has been
exposed or that there is no film left in the
magazine.
The film reminder (24) can be set at the ASA
or DIN speed of the film used. You set this
speed by flipping down the hinged clip and
turning the serrated ring. There is a space be-
hind the clip for a film box end.
Fig 43