A thin, straight line of slight underexposjure appears on one side of my prints.

Discussion in 'Enlarging' started by John Neyenesch, Apr 13, 2012.

  1. John Neyenesch

    John Neyenesch Member

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    When I attempt to make a print a thin, straight line of slight underexposure appears on along one side of the print. The frequency of this happening is unpredictable; sometimes there is no underexposed area, sometimes there is. I've checked the negatives and they are fine, so the problem must be in the enlarging process itself. I'm wondering if the problem could be my two and a quarter film holder with is old and a little sprung. I thought I check before buying a new one. Does anyone recognize this problem?

    Thanks for your help, John N
     
  2. michael_r

    michael_r Subscriber

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    Do you have a scan you can post? Is the line lighter or darker than the rest of the print?
     
  3. tkamiya

    tkamiya Member

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    Can you tell us what enlarger you are using?
    Negative size?
    Lens?
    Can you also scan your image so we can see it?

    Couple of ideas....

    Are you using the correct condenser for your film and lens type? I can see this being a problem if you are cropping your image.
    If you are using a type of enlarger with movable condensers, is it in the right place?
    If you are using under-the-lens type contrast filter, is it centered with the center of your lens?
    Are you sure nothing is casting a shadow?
    Are you sure your lamp in the enlarger is centered correctly?
    Did you remember to feed your cat?

    It's all random thoughts because we know very little of your equipment and process.
     
  4. MattKing

    MattKing Subscriber

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    John:

    Welcome to APUG!

    When you say a thin, straight line of slight underexposure, are you saying the line is darker on the print or lighter on the print than it should be?

    If it is darker on the print, I would check for reflection off the carrier.
     
  5. fotch

    fotch Member

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    Hello John and welcome to APUG.
     
  6. Bob Carnie

    Bob Carnie Subscriber

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    It is probably a neg carrier edge that is causing bounce light .. blacken the edges of the negative carrier.
     
  7. michael_r

    michael_r Subscriber

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    It could also be reflection off an edge of the easel (assuming the line is darker than the rest of the print). Would have to know what kind of easel is being used as this only occurs with single size easels which have a ~1/4 inch think hinged metal frame holding down the paper.
     
  8. ic-racer

    ic-racer Member

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    If this is a diffusion enlarger with a light-box, try taking the negative carrier all the way out. Mark out the projected image of the light-box opening on the base board. Then put the negative carrier back in. The projected hole in the negative carrier should be right in the middle of the light-box marks on the baseboard. If it is too close to one side you can get under exposure on one edge.