Canon AT 1 - Manual (Page 37)

take-up spool making sure that the perfora­
tions of the film are engaged in the teeth of
the film transport sprocket.
Then, make sure that there is no film
slack. In case there is, gently turn the film
rewind crank in the direction of the arrow to
obtain proper film tautness and the film ad­
vance lever to ensure that the leader is wound
fully on to the take-up spool before the
camera back is closed.
When loading the film into the camera,
do not touch the shutter curtain, the film rails
or the pressure plate.
Closing the Back Cover
Close the back cover until it snaps shut.
Gently turn the film rewind crank clockwise
in the direction of the arrow to take up the
film slack. Then, advance the film a couple of
times pressing the shutter button until the
first exposure appears in the frame counter.