8.1 What is the most workable method of projecting super-16mm workprint with separate fullcoat magnetic soundtrack?
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This article is from the rec.arts.movies.tech FAQ, by Scott E. Norwood snorwood@nyx.nyx.net with numerous contributions by others.
8.1 What is the most workable method of projecting super-16mm workprint with separate fullcoat magnetic soundtrack?
8.1.1 Double-Band Interlock Projector
There are several possibilities, since it is not possible to make a
super-16mm print with a standard optical or magnetic track. The most
common method is to file out the edge of the gate (opposite the claw)
in a Siemens or Palmer double-band projector (which were both made in
the early-to-mid-1970's, and are used to project 16mm workprints with
an interlocked magnetic soundtrack). Unfortunately, parts are
apparently not available for these machines anymore, and the
projectors themselves are difficult to find, fairly expensive, and
clunky to work with.
This type of system can be improvised, using an ordinary projector, by
mounting a `sync block' after the second projector sprocket, and by
mounting a magnetic head on the sync block. The picture film is then
loaded into the projector, and passed through the sync block, and the
magnetic film is on reels, mounted on manual rewinds, and passed
through the sync block. Since the film and magnetic film are both in
the same sync block, they are guaranteed to stay in sync throughout
the reel. Of course, the projectionist must crank the takeup rewind
throughout the show, in order to take up the magnetic stock.
8.1.2 Standard Projector Interlocked With Dubber
The alternative method (which is used by many film laboratories for
their screening rooms) is to file out the gate of a standard 16mm
projector (or just buy and install a super-16mm gate for it), and
interlock the projector to a Magnasync-type magnetic sound dubber,
which will follow the speed of the projector and reproduce the
soundtrack in perfect. This method is reliable and widely used, but
almost requires a permanent setup (not good for location work), and
can be expensive.
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