Canon 3749B002 On-Screen Manual page 495

Note
Depending on the film in use, the
spaces between frames may not align
with the white lines on the Film Holder
when the film corners are inserted under
the tabs on the Film Strip Frame. In that
case, prioritize the alignment of the
spaces between frames with the white
lines.
5.
Align the tabs on the Film Guide with
the indentations on the left and right
sides of the Platen.
Note
When a film strip shorter than the Film
Strip Frame is scanned, the image of the
frame next to the area without film may
appear whitish. In that case, cover the
area without film with black paper or the
like.
A sticker label attached to the margin of
the film may be recognized as an image.
6.
Gently close the Document Cover.
5.
Gently close the Document Cover.
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