OK, a couple of points.
1. I'm glad we're keeping this Zapruder film issue alive. It's been a decade or so since I last encountered it. Important that it not be lost to posterity, like Amelia Earhart or Judge... Judge.... what was that guy's name who mysteriously vanished in the desert? Judge something.
2. That film sounds cool.
3. Those of us who live in major 21st century urban settings cringe a little when you old folks call film transparencies "trannies." We have another meaning for that word.
4. Crater! It came back to me! Judge Crater! Like Danny Cater but with an extra 'r'. (Danny Cater: part of a baseball tradition, Ron Swoboda, Rusty Staub, Lou Piniella, Keith Hernandez, Wade Boggs: slow white singles hitters.... ) None of those guys vanished (they were too slow, actually, to vanish anywhere) but Judge Crater he just up and disappeared.