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Thread: Help with Neg defect

  1. #1
    8x20 8x10 John Jarosz's Avatar
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    Help with Neg defect

    I need some help deciding what happened on two 8x20 B&W negatives. I made two exposures, one right after the other, which I only do occasionally when I feel I need a back-up neg. Film is Efke 100 developed in HC-110 dilution B. I have made comparative jpg's of the neg and a positive image of one of the defects along with another showing a scale just to emphasize that this is a relatively large defect on the 8x20 neg. The defect is in different positions on the two negatives. There was no such feature in the sky. I have never seen this type of defect in any of my negs and I'm using the same lens I have always used. The sun was behind me. I don't believe it's a reflection because the negative is less dense in the defect area. Could this be an emulsion defect? Developing defect? I saw it immediately while it was still in the fixer. I'm interested in hearing some thoughts. Thanks very much.
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  2. #2
    Jac@stafford.net's Avatar
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    Re: Help with Neg defect

    Were they particularly long exposures?

  3. #3
    8x20 8x10 John Jarosz's Avatar
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    Re: Help with Neg defect

    No. 1/30 or 1/10 I forget

  4. #4
    Gary Beasley's Avatar
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    Re: Help with Neg defect

    Looks like an airbell, a bubble stuck to the neg during development. That or a dust bunny floating around in the camera.

  5. #5
    8x20 8x10 John Jarosz's Avatar
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    Re: Help with Neg defect

    I believe the dust bunny more than the air bell but not by much. I'd believe the airbell if there was only one, the negatives were developed separately. It seems way too co-incidental for it to happen on sequential negatives and in almost the same place.

    But if it WERE an airbell (which I've never had before), would a wetting agent in the developer help prevent them?

  6. #6

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    Re: Help with Neg defect

    Less density therefore either less exposure or less development one would think. Many years go had the same thing happen to me (in the sky area) on 8x10 film. "Fogged" another sheet from the box under the enlarger. Several same defects appeared on that negative. Re-examined the initial negative and found several more defects in other areas of the image. Turned out to be defective film. Tested several more sheets from the box and all had similar defects on them. Had to throw away whole box of film.
    Greg

  7. #7

    Re: Help with Neg defect

    Perhaps a drop of Edwal LFN in the developer. Although I have not yet experienced airbells, I recall several posts that did and the LFN was recommended. I bought some and plan to switch to it when my other is used up.

  8. #8
    8x20 8x10 John Jarosz's Avatar
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    Re: Help with Neg defect

    "Fogged" another sheet from the box under the enlarger.
    Not a bad idea.

    My reluctance to accept airbells as the cause is fueled mainly by the size. I would think something that large would have to float off. Airbells from my 6x6 days were tiny.

  9. #9
    Jim Jones's Avatar
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    Re: Help with Neg defect

    I've never added a wetting agent to developer, but routinely use it in a prewash with tray development. This was absolutely necessary when processing Tech Pan in Solarol developer.

  10. #10

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    Re: Help with Neg defect

    What did you do to dislodge air bells while you are processing your film? Or don't you do anything to dislodge them?

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