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Re: Comments re: Film Reg.
- To: telecine at sun.alegria.com
- Subject: Re: Comments re: Film Reg.
- From: JSnopes at aol.com
- Date: Sun, 3 Aug 1997 00:10:48 -0700 (PDT)
- Old-Date: Sun, 3 Aug 1997 03:10:43 -0400 (EDT)
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- Organization: Altruistic Intentions, Hollywood, CA
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- Reply-To: Rob Lingelbach <rob at alegria.com>
- Resent-Date: Sun, 3 Aug 1997 08:23:33 -0700
- Resent-From: rob at sun.alegria.com (Rob Lingelbach)
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>I thinnk that the difference here is that, the Sprocket wheels are always
>moving at a constant speed and the film is not. A CLAW is used to engage the
>film, at or near the aperture plate, and pull the film through one frame at
>time. Because the film starts and stops, there is a loop, above and below
>aperture plate (GATE), between the gate where the film is moving in an
>intermittent motion, and the sprocket rollers which drive the film. At
>this is how my movie cameras, and my Regular 8mm, Super 8mm , and 16mm
>There are of course exceptions to this rule. At frame frates above 500 FPS
>(So I believe) intermitent motion becomes mechanically impossible, and so In
>that case the film is transported continuosly, with the image being
>through a rotating prism. BTW. Flatbed Editors used this rotating prism
>method for film transport.
>So As I understand it, the sprocket rollers, drive the film at a continuous
>rate. The CLaw pulls the film through the Aperture area, of the camera or
>projector, with an intermitent rate. As to what drives the telecine I have
>idea, usually 60 herz in the U.S.
Well, actually, in professional projectors a Geneva movement (or "Maltese
Cross", which drives a precision sprocket -- intermittently -- one frame
at a time) is used for pulldown, not a claw. Claw-type movements, with
their cams, etc, wear down -- projectors run many more hours than
cameras do, with far less maintainance. (Look at how lousy most
projection is these days. I sat through a film with poor registration
the other night because the Geneva probably had run dry for a year or
Still, I don't see the logic in doing this in a telecine anymore -- does
anyone really miss FR35s and TP66s? (OK, the TP66 had claws, the FR35
had a stepper pulldown, but I am talking about using an intermittent.)
Looks to me like Rank and Philips had done pretty well just using
continuous motion -- gentle on the neg, too.
But Sony is as Sony does, to paraphrase the worst film of a couple of
My first post here, I'm a newbie, a DP in Muncie, Indiana.
Don't mean to insult multiplexes, the claw-user, or Robert Zemeckis.
Sorry if I failed.
+++ thanks to Donna Chapman and Pacific Radio for support of the TIG in 1997
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