Single
perf film has perforations on just
one edge of the film. All Super-8
and Super-16 film is single perf.
In order to increase the image area
of 16mm to that of Super-16, the image
area was extended to the very edge
of the film. A sprocket hole on that
far edge would be seen within the
projected image and appear as a big,
bright white spot on the screen. Super-8
film makes provision for a magnetic
audio stripe occupying the edge where
the perfs have been omitted. Standard
16mm film is the only other single
perf film you will be concerned with.
The optical sound track on 16mm film
replaced the perfs on one edge of
the film. With perfs on only one edge,
the way a roll of film is wound (and
which side the perfs are on) becomes
very significant.
