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  1. #11
    AgX
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    I guess all plastic cartridges with that "arm" originate from the same manufacturer: AP
    At least the ones I saw all looked the same.

  2. #12
    David Lyga's Avatar
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    Perhaps, AgX, but I do not know why the Russian ones did not have that important arm, whose purpose is to block light at the most vulnerable point where the film exits the cassette. - David Lyga

  3. #13
    AgX
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    Aside of very old cassettes, type 135 metal cassettes (single- and multi-use) do not have that arm either. The idea was that plush protruding at the short side would seal the slit.
    So when starting from the standard type 135 cassette when designing a reusable plastic version with twist cap, one would not necessarily consider an arm.

    I shall have a look at those soviet cassettes.

  4. #14
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    "Lightproofedness" of plastic cassettes for bulk loading

    Someone mentioned that Efke cassettes have screw tops. Is that true and does it go for all types of Efke film?

    Philip

  5. #15
    David Lyga's Avatar
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    Correct, ApX, the plush felt sticking out from the sides of metal cassettes is the baffle that the 'arm' on plastic cassettes provides. When you screw a cap onto a cassette, on the other hand, the 'sticking out' of felt becomes impossible to have; thus, the 'arm'. - David Lyga

  6. #16
    AgX
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    Whether a cap is screwd on or clipped on, the interference with the plush should be the same.

    But over time a number of type 135 cassettes have been designed, all varying from each other.

  7. #17
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    Quote Originally Posted by Gerald C Koch View Post
    I don't like the plastic cassettes. I have had the end come loose and ruin film.
    They do seem to unscrew with little effort. To make myself feel better, I put a little blue painter's tape on so that a edge of the tape covers the edge of the cap. It gives me something to make note on as well.
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  8. #18

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    Quote Originally Posted by bobwysiwyg View Post
    They do seem to unscrew with little effort. To make myself feel better, I put a little blue painter's tape on so that a edge of the tape covers the edge of the cap. It gives me something to make note on as well.
    I use a mini Avery pressure sensitive label for same purpose.

    The spool in the OP first post is not the original pattern it is from a factory crimped cassette, it is more difficult to secure the film to this type, less area to stick to.

    Otherwise it should be ok.

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