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  1. #1
    polyglot's Avatar
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    homemade 70mm loader

    I've been looking for a 70mm loader on eBay for a while and I refuse to pay the $250 that these things seem to sell for so I hacked one up out of a couple bits of wood and M6 bolts this evening. The bolts screw in/out to support the two spools and the big screwdriver is how you turn the takeup spool. Obviously this is not a daylight loader

    One puzzle I did have is that once the spool was loaded (I went to about 0.5mm smaller than the spool flanges) and installed in the cassette, it did a big unwinding inside the cassette after about a minute. I suspect that means the back of the film will be dragging on the inside of the cassette, so I hope I don't get any problems with scratches.
    Attached Thumbnails Attached Thumbnails 70mm-loader.jpg   70mm.jpg  

  2. #2
    fatboy22's Avatar
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    Nice, I do the same thing. Load the film in my darkroom. I gave up trying to buy a loader a long time ago. Can't believe how rare and expensive they are.
    Keep Film Alive, Shoot Everyday!
    JamiesInfraredPhotography.com

  3. #3
    gorbas's Avatar
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    Nice work Polyglot! I recently started playing with Kodak 70mm Double-X Aerographic film 2405. For loading cassettes I come with this rig:
    Click image for larger version. 

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    Are you loading 70mm film back with lights on?
    Goran
    Last edited by gorbas; 02-12-2013 at 02:19 PM. Click to view previous post history. Reason: clarification

  4. #4
    munz6869's Avatar
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    aah, that reminds me...

    Marc!
    Marc Morel
    photographie argentique!
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    http://mrmarcmorel.wordpress.com/

  5. #5
    polyglot's Avatar
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    Gorbas: I can see a bolt supporting a core there - is that where your source spool goes? Does anything else support the cassette spool or do you just hand-hold that?

    I'm loading cassettes into the back in the daylight and assuming the felt traps work OK. The Mamiya back requires you to wind on two frames after closing the back before it reaches "1" on the counter, so that will pull enough fresh film from the spool. While I could no doubt load in the dark and get two more frames, I don't know the back well enough to do that yet and it's fiddlier than a 120 back. The whole bottom comes off in order to insert the cassettes, and it has to go back on quite precisely.

  6. #6
    gorbas's Avatar
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    Hi Polyglot, On my picture, plastic core is only for illustration, since my 70mm reel still lives in the dark. You are right, the bolt is holding my film reel. I'm holding film spool in my hands and just roll it. On the end I insert spool into cassette.
    I loaded Double-X Aerographic film 2405 to film back on the room light and had severe light leaks. From now on I'm doing it in total darkness. 2405 is with "ivory" colour backing and transmitted light a lot. I'm cinematographer by training and dealt a lot with daylight loading of 16mm film on 100' rolls and never seen such leaks. Yes, with Hasselblad back you also had to wind a few frames after loading the 70mm back. When I reached the end of film i unloaded it from the magazine and had light leaks from that end too. One fine lesson in handling 70mm film! Just rolled 2 cassettes today and loaded one all the way to magazine in the dark.

  7. #7
    polyglot's Avatar
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    So your cassettes don't see any light between them being filled and being inserted in the camera? Does that mean you're attaching the leader to the takeup spool in the dark? If you're doing it all-dark, maybe you could ignore the cassettes entirely and just use the spools as long as they don't unwind themselves.

    They do say the cassettes get leaky over time. Have you tried a different/new cassette? Which part of yours is leaking?

    I think the 2405 is without antihalation backing (certainly doesn't look like it has one!) and probably intended for direct loading of 150' and 600' rolls into surveillance cameras.

  8. #8
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    Great MacGyver!
    Andy

  9. #9
    gorbas's Avatar
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    Hi Polyglot, yes, from now on, everything is going to be done in dark. I will keep cassettes for some kind of protection (still not sure from what?). My 70mm cassettes look "tired", with decent gap between felts, but where you can buy them new now? Most prices for 70mm film on Ebay are just crazy. You can almost buy any fresh 120 film in same quantity for less money. If this system of loading in the dark works, I'm not going to buy new ones.
    You are right, 2405 doesn't look like it has antihalation layer. I can see it on very bright subject's. What Kodak emulsion are you using? Any idea how many of us here are using 70mm? Stone NY, you, me???
    Goran

  10. #10
    polyglot's Avatar
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    Yep, and snaggs.

    I have 2405, Rollei IR400 and 160NC. snaggs might have an angle on some 600' rolls of near-fresh Aero Plus-X too.

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