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  1. #1
    jim kirk jr.'s Avatar
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    infrared film and pressure plates

    Here is my dilemma,

    My Cameras(35mm) have pressure plates with holes cut out for date imprinting,which I don't have anyway.With any lens in my possession at their
    widest angle and with an 89b filter and above the negatives and print get a ghost image from the cut-out.Obviosly this is a result of the nanometer cut off from the filter(#29 and #25 red do not cause this)and in an attempt to rectify the situation I've placed aluminium foil with electrical tape on the back of the camera,to no avail.Short of buying new cameras(not an option at the moment)or new pressure plates is there any other option.Other than that there has been no other issues with regards to infrared film.

    Thank you to anyone who can help.
    Jim

  2. #2
    David R Munson's Avatar
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    Well, what kind of camera do you have?

  3. #3
    glbeas's Avatar
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    Best cure for this is to tape a piece of black paper backing from a 120 roll of film onto the pressure plate. Be sure the tape doesn't hang on the film path.
    Gary Beasley

  4. #4
    jim kirk jr.'s Avatar
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    Cameras are Canon Elan 7,no issues with fogging(maco 820)and this is the film in question.
    I've had great success with the film ,even with an 89b filter-the ghost image occurs mainly with flat areas of even tone.Usually I use a #29-Less IR effect but sometimes,especially with contrast,less works best.

  5. #5
    jim kirk jr.'s Avatar
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    Thanks Gary,
    I'll give it a try-I did try to tape a piece of developed film to it but Maco film seems to be thicker than most films and did not fare to well.

    Jim

  6. #6
    David R Munson's Avatar
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    Next question - can you buy replacement backs for that camera?

  7. #7
    jim kirk jr.'s Avatar
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    It's a possibility that I could,I'd imagine canon makes them and was being "cost-effective" by putting the plates with holes in cameras with no date imprinter.Thanks Dave,I'll check into that suggestion as well-although I'm going to try Gary's idea first.

  8. #8
    glbeas's Avatar
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    Some folks have also used a piece of aluminum foil on the back to enhance the halo effect. Important point in this is to have the same reflectivity across the entire pressure plate. Either way will eliminate the ghost images from the data port.I doubt you would want to put another back on the camera, wouldn't be cost effective. If you are going to dedicate the camera to doing infrared though you might look into a between the film rail filter so you can see to focus with a visually opaque filter.
    Gary Beasley

  9. #9
    jim kirk jr.'s Avatar
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    Thanks for the info-would I put the foil on the back of the plate and if so would that stop the ghost image or do you mean put the foil on the front of the plate in contact with the film instead of 120 black paper?I've ben a dedicated infrared user(sometimes near infrared ,konica750,maco cube 400 plus and ilford sfx)for over a year now and usually i just focus first then screw in the filter.I tried a "pro-grain" filter(inside the camera)and discovered that no matter how clean I thought things were,they were not.
    Is dust attraction an issue with those filters?

    jim

  10. #10
    glbeas's Avatar
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    The foil would be used instead of the black paper. Sadly dust is prone on mylar in a dry climate from static charges. A polonium brush like used in the darkroom may help.
    Actually the best system I ever used for IR was the twinlens MF, with the IR filter on the taking lens you can still see to focus.

    BTW what is a "Pro Grain" filter?
    Are you familiar with WJs page and the Infrared mailinglist?
    http://www.a1.nl/phomepag/markerink/mainpage.htm
    Gary Beasley

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