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  1. #1
    hrst's Avatar
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    Easy way to perforate 35mm

    I wrote earlier I'm building a 35mm perforator from scratch. It works quite well for acetate, but may not be for great importance even if I posted instructions how to make one, as it will be a project that takes much time and requires tools not available for everyone.

    Instead, I have found a simple and easy medium- or low-cost solution for a hobbyist to perforate our own film coatings. Whereas I found out that products sold as "35mm perforators" are very expensive special products, there are 35 mm motion print splicers that are actually meant for joining film ends together with tape, but some of them have perforator pegs to perforate through the tape. Correct search term is "35 mm splicer".

    The one I bought from the USA was Dr. Leo Catozzo model available on Ebay quite often. You don't have to pay so much for them if you wait for good deals, but I was able to get one very quickly for 150 USD. I know they go for less every now and then. Note that all 35 mm splicers do not have the perforators, but at least the Catozzo model does.

    This one does 5 adjacent perforations at a time. For perforating non-perforated film, registration pins from either side should be removed, which is very easy to do. Then, the actual perforating can be done in dark and is quite quick and easy to do with nitrile gloves etc.

    I have attached a scan of polyester sheet (the same I have coated on) and an acetate film (cut from 120 Ektachrome film) perforated with this tool.

    Polyester is hard to perforate perfectly, but remaining pieces can be cut off with small cutting pliers or scissors.

    A bigger version of scan is available at http://www.students.tut.fi/~alhonena/splicer_big.jpg
    Attached Thumbnails Attached Thumbnails splicer.jpg  

  2. #2
    holmburgers's Avatar
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    Wow, what a great idea.

    Would you be able to post a picture of said splicer? Have you gotten a long enough test sample yet and loaded it into a cartridge to test its transport in a camera?

    Although I've yet to make emulsions, the allure of being able to make my own 35mm film might drive me to it sooner. (though i'm sure the difficulties are many!)
    If you are the big tree, we are the small axe

  3. #3

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    I am trying to figure out why you'd want to do that. What practical purpose does it serve?
    Frank Schifano

  4. #4
    hrst's Avatar
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    holmburgers, search Ebay for "Leo Catozzo splicer", you'll find pictures. For instance, http://cgi.ebay.com/Dr-Leo-Catozzo-M...ht_4814wt_1138 . I find no reason why it wouldn't run in a normal 35mm camera. The requirements are not so high in still photography. Motion picture is different, though, as precise registration is must and the perfs must endure the film tension and driving force.

    fschifano, well, DIY film does not serve any practical purposes, which is true for most hobbies, including photography for most if not almost all of us here. That's why they are called hobbies. I find it very interesting to be able to do my own film.

  5. #5
    holmburgers's Avatar
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    hrst, thanks for the link.

    Have you been making emulsions? If so, do you plan to attempt a 35mm film at some point?

    And fschifano, you shouldn't have to try to hard to see the utility of this. Granted there are many manufacturers of excellent 35mm film, but what if someday there were not? A camera makes a lousy paperweight, despite what people say. And besides, no one uses paper anymore....
    If you are the big tree, we are the small axe

  6. #6
    hrst's Avatar
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    Quote Originally Posted by holmburgers View Post
    Have you been making emulsions? If so, do you plan to attempt a 35mm film at some point?
    Yes, last time we made emulsion was this; http://www.apug.org/forums/forum205/...t-results.html . And yes, we plan on making 35mm. I didn't buy this splicer just to test it .

  7. #7
    holmburgers's Avatar
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    Ahh, I recall seeing that. Thanks for the reminder. Can't wait to see the results, and if you're selling any, I'll take a roll
    If you are the big tree, we are the small axe

  8. #8
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    hrst,

    Thanks for posting this. The idea of making 35mm is a lot of fun to think about. It certainly rounds out the emulsion-making picture. I suspect you got a really good deal on your splicer. The ones listed right now are considerably more expensive. But, never say never! I'll be checking ebay regularly. I think you found the hot Xmas toy of 2010

    A reminder note: If anyone is really interested in making roll film, and can forgo 35mm during the learning curve, 120 isn't perforated and is straightforward to produce, load on reels and in the camera, shoot and process.

  9. #9
    hrst's Avatar
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    My friend got the Catozzo splicer for something like $80 IIRC, but he said it takes time to find a deal like that :-). Mine was "200 USD or best offer" and my offer of 150 USD was accepted. And, Catozzo is not the only one that has perforator claws. Just look at the pictures, some of them may show the claws.
    Last edited by hrst; 09-30-2010 at 07:11 PM. Click to view previous post history.

  10. #10
    bsdunek's Avatar
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    When 8mm movie film was phasing out, I decided to build a perforator to convert 16mm film to double-8. I did the design, but machine shops wanted quite a bit to machine all the parts for me. Ended up not doing it, but sometimes wish I had. Of course, B&W double eight is still available, and that is all I could use anyway if I wanted to develop it myself. Oh, well.
    Bruce

    Moma don't take my Kodachrome away!
    Oops, Kodak just did!
    For all practical purposes, they've taken Kodak away.


    BruceCSdunekPhotography.zenfolio.com

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