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  1. #1

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    Odd higher density marks on RA-4 print; probably an optical issue.



    Firstly, I have processed and printed several rolls of colour negative film recently (although not Portra 800), exposed with my Bronica SQ-B, and not come across the illustrated density marks once. I've not yet scanned the film in to check whether it is on the negative itself, but I do suspect an optical issue as the density mark has appeared on black & white film as well, but again only the RF645 negatives. I've printed other frames from the same roll to 12x16" and not found the marks present.

    Has anyone else come across this particular problem?

    Tom

  2. #2

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    Could this be a culprit?:



    Tom

  3. #3
    dpurdy's Avatar
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    That hair would not cause the plus density. IF you are getting it with various films all from the same camera I would suspect it is some how a light leak or reflection problem with the camera though I know nothing about this camera.

  4. #4
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    Did you try printing a blank frame or changing enlarger lenses? You can also try cleaning your enlarger head. How are you processing the film? It could be a light leak in camera. Try running some 3200 speed film though the same film back and seeing if they're any worse.

  5. #5
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    same place in every negative that you've shot through that camera? I'd suspect light leak if its in the same relative place on every neg.

    break out the ground glass and put 'er on bulb, open here up, and see if you can find the light leak(if its from the lens side) it might be coming through on the back too

    -Dan


  6. #6

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    Quote Originally Posted by DanielStone View Post
    same place in every negative that you've shot through that camera? I'd suspect light leak if its in the same relative place on every neg.

    break out the ground glass and put 'er on bulb, open here up, and see if you can find the light leak(if its from the lens side) it might be coming through on the back too

    -Dan
    I've had the camera for over 3 years and only recently have I experienced these marks. I'll run a few tests.

    Tom

  7. #7
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    Tom,

    make a contact sheet, or just look at the negs on a lightbox, or a monitor with a white background, such as here on APUG !

    faster than scanning, etc....

    you should be able to see them on the negs, since those seem to be quite pronounced.

    -Dan


  8. #8
    tiberiustibz's Avatar
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    it almost looks like a chemistry drool...

  9. #9

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    I recently got a similarly shaped mark on two negs out of 15 films from my Bronica GS-1. Very similar shape and size - but more diagonal. They appeared in the same place on a consecutive two of four negs taken at the same time with the camera unmoved, on a tripod and with the same lens. (I was using different filters etc.) The scene was in Scotland and very similar to yours Tom - big sky landscape etc. It's definitely higher density on the neg and looks to me like a slight light leak or perhaps sun catching a filter ring or something and flaring back into the lens. Of course, the best of the four negs was affected - well we knew that, of course!

    The good news is that his neg was taken early in the trip and was on the first or second film and those two negs were the only one's to exhibit the problem. I'm going to ignore it until or unless the problem arises again.

    Bob H
    "Why is there always a better way?"

  10. #10

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    Quote Originally Posted by BobNewYork View Post
    I recently got a similarly shaped mark on two negs out of 15 films from my Bronica GS-1. Very similar shape and size - but more diagonal. They appeared in the same place on a consecutive two of four negs taken at the same time with the camera unmoved, on a tripod and with the same lens. (I was using different filters etc.) The scene was in Scotland and very similar to yours Tom - big sky landscape etc. It's definitely higher density on the neg and looks to me like a slight light leak or perhaps sun catching a filter ring or something and flaring back into the lens. Of course, the best of the four negs was affected - well we knew that, of course!

    The good news is that his neg was taken early in the trip and was on the first or second film and those two negs were the only one's to exhibit the problem. I'm going to ignore it until or unless the problem arises again.

    Bob H
    I've just printed some negatives from a roll only exposed with the 45mm lens and still found these marks on the prints; so perhaps it is a light leak. Next thing is to expose some film on blue sky with the Bronica SQ-B as a control. The RF645 exposed film is completely clean otherwise, no loose film type black markings on the edge of the film etc.

    Tom

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