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16mm film core adapter for 100ft spool cameras


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#1 CHET

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Posted 16 November 2005 - 10:29 AM

Time ago I saw on the internet a 16mm film core adapter for cameras like B&H or Bolex that use just 100ft film spools.
To be clear it allows to load the film in the camera without the 100ft spool but just with very common 16mm film cores.

Please, do you know where can I get a couple of them ?

Thank you in advance

Chet
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#2 Patrick Neary

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Posted 16 November 2005 - 11:34 AM

yikes- with a core adapter and core in there, is there any room left for film?
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#3 Mike Lary

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Posted 16 November 2005 - 12:35 PM

yikes- with a core adapter and core in there, is there any room left for film?

Not enough to be worth the effort. The core adapters are only useful if you have a magazine loading Bolex.
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#4 Sam Wells

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Posted 17 November 2005 - 10:37 AM

Plus you'd have to load the camera in total darkness.

-Sam
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#5 Robert Hughes

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Posted 17 November 2005 - 06:46 PM

More likely, the core adapters are for 400' magazines and the seller didn't know what he or she had.
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#6 CHET

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Posted 22 November 2005 - 10:19 AM

yikes- with a core adapter and core in there, is there any room left for film?




mmmhh....

You are right. Load a film core in place of a 100ft spool means to have much less than 100ft of film.
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#7 Charles MacDonald

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Posted 22 November 2005 - 09:40 PM

You are right. Load a film core in place of a 100ft spool means to have much less than 100ft of film.

I know I have seen a formula for calulating the size of a roll of fim, given the core size, and thickness of the stock. I suspect It is probaly in the ASC manual.

If you are using plain old 5 mil acetate film, a daylight spool is almost 4 inches across (3.615-inch ) . A core is 2 inches across, while the spool is 1 inch at the centre. so you should manage to get at least 50 ft of film on a core to fit inside the space that the spool takes up. Perhaps more if the camera is roomy. My filmo leaves so little room arround the spool taht it is hard to get the spool out. On the other hand my first 16mm camera, an OLD DeVry has at least an inch on all sides of the spool.

In many cameras you could use the same principal as is used in "displacement magazines" and allow for the fact that the takeup can occur in the same space that the feed was at loading time. In that case the pair of rolls take up the most space about the time they are halfway though.

Mught be worth an experiment. You could ask a still Phtographer for a core from 35mm Bulk film, (spec 401 or 402) which is 1 inch with a 1/4 inch hole. Cut that in half crossways and file it down to the width of a spool, then drill and tap holes for a couple of set screws. the areawith the film slot in the original core is probaly the stongest place. The set screws should be just big enough to engage the keyway of the 2 inch type T core.
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