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02/25/2014 08:01:21 AM · #1 |
I came across some unlabeled 35mm bulk film and I was wondering if someone knew what kind of film has these odd round holes between every 4 standard perforations.
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02/26/2014 06:47:06 AM · #2 |
Anyone?
I figure they're some kind of registration holes, more precise than the sprocket holes, but I dunno.
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02/26/2014 07:46:27 AM · #3 |
| Very interesting. This has me stumped but I am still trying to figure this out. Can you tell if it is b&w or color film? |
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02/26/2014 07:59:36 AM · #4 |
Most likely motion picture film of some sort. If the two extra perforations don't repeat, then it's probably to assist with initial loading or maybe orientation. But I'm no expert. You might want to post at APUG (apug.org) where there's more analog expertise.
Another option is to develop a clip and see if there's any information on the edge markings. Where and how did you aquire the film?
ETA: The smaller circular perforations are also spaced such that a standard 35mm movie frame would fit right between them.
Message edited by author 2014-02-26 08:04:36. |
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02/26/2014 08:00:04 AM · #5 |
| I don't know, but I'm wondering if it might be some kind of movie film, and the small holes having somethng to do with synchronization ... or maybe it's for a high-speed camera. |
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02/26/2014 09:00:35 AM · #6 |
Originally posted by bvy:
Most likely motion picture film of some sort. If the two extra perforations don't repeat, then it's probably to assist with initial loading or maybe orientation. But I'm no expert. You might want to post at APUG (apug.org) where there's more analog expertise.
Another option is to develop a clip and see if there's any information on the edge markings. Where and how did you aquire the film?
ETA: The smaller circular perforations are also spaced such that a standard 35mm movie frame would fit right between them. |
The perforations repeat over all of this film stock I've seen. It looks like it might be Kodachrome based on the appearance of the emulsion side. I got the film from the local art institute when I mentioned I was planning to bulk load my film for an upcoming class, she offered me two bulk loaders. One had what appears to be Tri-X in it and this film was in the other. Evidently, her predecessor was quite the pack rat and there's a ton of stuff they're slowly clearing out.
I'll develop a clip this weekend and see what pops up. |
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02/26/2014 09:09:36 AM · #7 |
Curiously, those are non-standard sprocket holes on that film: virtually all cinema film in the USA was perforated to BH (Bell & Howell) standard, but those are "rounded square" CS (CinemaScope) perforations. See wiki:
"In 1953, the introduction of CinemaScope—with its wider picture area and its use of four-track magnetic sound (four strips of magnetic tape coated on the film)—required another type of perforation. CinemaScope perforations are similar to KS perforations, but almost square in shape to accommodate the magnetic stripes.[7] These perfs are commonly referred to as CinemaScope (CS) or "Fox hole" perforations, or simply "Foxholes" (because, initially, all CinemaScope films were made by 20th Century Fox). Their dimensions are 0.0780" (1.85 mm) in width by 0.0730" (1.98 mm) in height. [8] Due to the size difference, CS perfed film cannot be run through a projector with standard KS sprocket teeth, but KS prints can be run on sprockets with CS teeth (see VKF, below). CS-perforated stock has fallen out of use since the 1970s when 35 mm prints with magnetic sound became uncommon."
I still haven't found anything specific to the pinholes, but they look like just that: precisely-spaced film-registration pinholes for use in film editing. |
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