Does anyone know how an optical printer with a "fixed-pin registration" pulls down? From what I've read, it sounds like the trap rails lift up and the film just slides by, then the rails retract. If true, then how does the film reliably remain in the focal plane from frame to frame? It would seem the film would bow or distort too much, lifting it in this manner.

Is there an intermittent sprocket?

Better yet, know where I can see a drawing of this movement? Thanks.

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Better Projection Pays!

You are correct that the film is sandwiched between rails in a "trap" that lifts the film off the registration pins while the film is shuttled, then drops the film back onto the pins. These printers are typically run only a few frames per second, so there is plenty of time for the film to stabilize its position and focus.

I just ran into something that might go with your last post on your project with the sound. The Smart Mod IIB has an option that synthesizes stereo from mono soundtracks.

Just thought I'd pass that along.

Tim