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Thread: Can lenboard cause light leak?

  1. #1

    Join Date
    Jul 2001
    Posts
    77

    Can lenboard cause light leak?

    Can lenboard cause light leak?

    Hello, kind and experienced photographers, I am being driven mad by white lines on my negs, I was generosly given a lot of advice in pevious post which I made r egarding this problem. Here is a sample image :

    http://www.duich.com/adriantylernet/site/white_lines.html

    I have checked the bellows for leaks, checked the mounting of the bellows, used various filmholders and films, carefully shaded the filmholders at the time of e xposure until I am sure that no light is is leaking in throught the back of the contraption.

    The latest results are completley free of leaks apart from the fine white line a round the image, could this be the lensboard? is it worth changing it, or should I give up and take it to a technician?

    thanks again

    adrian

  2. #2

    Join Date
    Jan 1998
    Posts
    262

    Can lenboard cause light leak?

    Adrian,

    Hmm, those are odd light leaks, such confined lines. I am assuming they are not contrails . .

    Lensboards can indeed cause light leaks. I have to tape up my deardorff boards each time. It's easy to test. Remove the back of your camera and in a dark room stick a 60 or 100 watt bulb in the bellows (not for long- it gets hot) with the lens on. This is easier in an 8x10 camera.

    But I don't think those leaks are from the lensboard. I don't think a lensboard leak would cast such narrow beams of light.

    Do some more tests tonight when it gets dark (or in your darkroom) and you'll get the answer.

    Good luck.

  3. #3

    Join Date
    Feb 2001
    Location
    Los Angeles
    Posts
    2,205

    Can lenboard cause light leak?

    Adrian: I've looked at your photo and I also vote for jet contrails in the sky as the most likely explanation. First, they look like contrails. Second, they end at the edge of the building, which a feature in the distance will do, whereas a light leak would just go across every part of the image indiscriminately. There are times when contrails can appear rather noticeable on film while being not so obvious when you were out in the bright sun, concentrating on other things. Yes, a lens board can leak light, but they usually don't. When they do it doesn't look like this.

  4. #4

    Can lenboard cause light leak?

    You say white lines on your negatives,but this is a positive print with white lines?The lines on this picture do not resemble a light leak.Light leaks tend to spray unfocused light around,causing fog on the film,not sharply focused white lines in a print.The above test can be done with a smaller than 100 watt light bulb.Try a 40 watt bulb inside the camera in a completely dark room.Hold up a sheet of white paper all around the camera,and watch for light strikes on the paper.

  5. #5

    Can lenboard cause light leak?

    Adrian,

    They are contrails. From the looks of them you live somewhere in the mountainous western states or some similar region. If I'm right there's a good chance they weren't in your ground glass frame when you were composing but drifted in before you took your shot.

    Thats my 2 cents

    Kevin

  6. #6

    Join Date
    Feb 2002
    Posts
    62

    Can lenboard cause light leak?

    hi Adrian,

    What is peculiar is the direction of the streaks of light. In the beginning i thought it to be a leak in the back of your camera, then, as i said i noticed that the leaks have all the same angle which motivated me to hold responsible maibe the lens shutter? The streaks are quite sharp which could be given by the fact that the distance lens-film is short ( if you are using a WA) Could it be that some light reflects in one of the shutter blades ?Who will win this contest?

  7. #7

    Join Date
    Jul 2001
    Posts
    77

    Can lenboard cause light leak?

    OK guys, cool your jets!, those are some pilots up there, they are in ALL my negs/pos. LOOK CLOSER, the white lines are all around the border of the print, just inside the black border. The contrails are exactly what they seem, I hope its the lesboard, it is starting to sound like it is coming from outer space! (not castille, spain)

    ade

  8. #8

    Can lenboard cause light leak?

    Adrian:

    What type of film holders are you using? Those white lines look like reflected light off of the inside edge of the opening in the film holder. This effect has been mentioned in other threads as being noticed with the new Kodak Single Sheet Readyload holder.

  9. #9

    Join Date
    Feb 2001
    Location
    Los Angeles
    Posts
    2,205

    Can lenboard cause light leak?

    Oh, now I see what you're talking about. Other than a little excess exposure from light reflecting off the edges of the film holder I have no idea. Maybe it's contrails from a pilot who is really, really precise.

  10. #10

    Can lenboard cause light leak?

    Ok, Earlier I showed my prowess at pointing out contrails. Is there any chance that the white streaks at the border of the image have something to do with development? Maybe a negative frame that doesn't permit the chemistry to reach the emulsion where it gets clamped? Otherwise, good luck.

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