cutting sheet lith film

Discussion in 'Darkroom Developing and Printing' started by sreenath, Jul 19, 2007.

  1. sreenath

    sreenath Guest

    Hi All,

    I would like some tips about cutting sheet lith films so that I can
    roll it into 120 roll film, or load into pinhole/box
    camera.

    I get this film in 20"x24" size.

    I once did it and found it very hard to cut the film- I used the
    normal print paper trimmer. The film is too
    thin and the blade simple moved over the film instead of cutting it.

    One more problem was holding the film still. It tends to curl and wrap
    around severely. The film itself is sold rolled
    in a 2" dia plastic tube. Would it be possible to make a fixture for
    this purpose?

    I regularly use get normal 120 film, so this is just for fun. This
    film has no grain whatsoever.

    thanks for any tips,
    Sreenath
     
    sreenath, Jul 19, 2007
    #1
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  2. Sandwich the film between two sheets of cardboard. Then cut both cardboard
    and film simultaneously.

    Place a piece of duct tape running parallel to the cutting edge at a
    suitable distance from that cutting edge. Butt the side of film/cardboard
    sandwich against that tape to help hold everything steady as you cut.
     
    Lawrence Akutagawa, Jul 19, 2007
    #2
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  3. message
    I suggest gaffer tape rather than duct tape. The two are
    often confused. Duct tape is meant for wrapping air
    conditioning ducts and has a very persistent adhesive which
    tends to migrate from the edge of the tape making a mess.
    Gaffer tape has a different kind of adhesive which does not
    migrate and is easily removed. I would also suggest taping a
    strip of cardboard to use as a guide and using "kraft" paper
    rather than cardboard to sandwich the film. It will still
    hold the film in place but is easier to cut.
    Unless the trimmer blades are very sharp they will
    simply mash down some materials. There must also be enough
    force between the blades. Most trimmers have an adjustable
    coil spring at the blade hinge. If this is too loose the
    trimmer will not cut cleanly.
     
    Richard Knoppow, Jul 19, 2007
    #3
  4. sreenath

    Ken Hart Guest

    As you're pushing the blade down, also push it toward the body of the paper
    cutter.
    Reverse roll it for a day or two and put it back in the tube?
    Have you tried contact printing your regular negatives on the lith film?
     
    Ken Hart, Jul 19, 2007
    #4
  5. sreenath

    sreenath Guest

    Thanks for the tips. I will try these. The blade is not all that
    sharp, and even for cutting paper, sometimes I have to press the blade
    towards the cutting frame.

    Regarding contact printing regular negatives on lith film, I have done
    this, and I should say that I got pretty good slides.
    I developed under red safe light by inspection using very dilute
    developer with bisulfite added. That gave normal contrast in the
    slides.

    Sreenath
     
    sreenath, Jul 20, 2007
    #5
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