Hasselblad Problem!! Lightleak? HELP!

Discussion in 'Medium Format Cameras and Accessories' started by Rinthe, Apr 20, 2010.

  1. Rinthe

    Rinthe Member

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    I've posted this problem already on apug on a different section. But the problem wasn't solved and then some new problems! so here it is.

    At first i was getting these lighter edges on the sides of the pictures, as you can see from the picture, against the black border, theres a thin line that's lighter than the rest of the picture. First i thought it was some sort of light leak, so people here suggested that i replace the light trap. I did, but that didn't fix the problem. This is the first roll i shot after replacing the light trap. The shots came with a dark vertical line a little to the left of center in every shot. But only really visible if the picture is somewhere in the midtone range, i can't tell in lighter or darker images.

    I think this couldn't have been a light leak, cause if it is, shouldn't the black border itself get exposed instead of the picture part only? Anyone know what's causing the brighter sides? and what caused that dark vertical line? I am so confused.

    [​IMG]
     
  2. henpe

    henpe Subscriber

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    As regards the black line, inspect the film back. I had similar streaks on a couple of rolls from my Bronica ETRSi (they were a bit more distinct though). I discovered a sharp edge in the film back that scratced the emulsion of the film. So, carfully inspect the neg for scratches and the film-back for anything that could possibly cause the scratches, if any.
     
  3. Q.G.

    Q.G. Inactive

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    First things first: what are you/we looking at? The negative? A print? A scan? Can you see these thingies on the film itself?
     
  4. Rinthe

    Rinthe Member

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    you're looking at a scan with the hasselblad scanner, it's from my school. these black lines only show up on this roll, not any other rolls. but the brighter edges have been consistent on all images.
     
  5. Rinthe

    Rinthe Member

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    I checked the back, everything seems to be smooth. couldn't find anything that could be scratching the film.
     
  6. scootermm

    scootermm Subscriber

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    the lighter edges looks like density build up that can be caused in developing. agitation being heavier at the edges, this is really common with large format sheet film, especially when developed in trays not adequately large. Perhaps it is a density buildup caused by the manner that the film is being developed.
    If it were a light leaked caused in the A12 back, I'd think it would be in the black border region... at least in my experience, leaking A12 backs or leaking 120 rolls showed up in the black border area.
     
  7. Q.G.

    Q.G. Inactive

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    Where light leaks show depends on where and when the leak occurs/occured.
    The 'usual' light leak is caused by the dark slide slot seal not sealing anymore, and light entering will hit the image area of the film. The black borders are that, black i.e. unexposed, because they are shielded against light by the edges of the film gate, and light cannot get there through a leaky seal.

    Leaks occur at other places in Hasselblad backs too, but only very, very rarely.

    One other place that could be responsible for the pattern we see is opposite the dark slide slot, where the magazine's front plate rests on the frame of the shell.
    If the plate doesn't sit properly (perhaps because the screws aren't done up tight, or because it wasn't put back properly the last time a dark slide slot seal was changed) some light could get in through the slot through which the gears of back and camera engage. Could, but very unlikely.
    It would be consistent with where the lighter band is.

    However, it would not be consistent at all with how the lighter band stops where the lighter part of the subject stops also.
    Other places where light could get in exist too (for instance, if the magazine sits rather loose, light could get in between canera and magazine), but again it would be very hard (impossible) to explain how light entering from anywhere where it shouldn't could correspond so perfectly with th elight entering through the lens during exposure.

    So despite the many words above, i think it is not a light leak.


    The thing to figure out is how this artefact could echo the image content, appearing where the image itself is a bit lighter, not where the image is dark also.
    The fact that the dark edge of the frame, with the Hasselblad "V"s, remains clear could either indicate that the thing occured either when the film was exposed (light entering through the lens bouncing/reflecting off something. But what? And how?), or when the film was developed (edge between clear part of the film, i.e. where there is no silver to be developed, and exposed, developable part of the film. So an edge-effect of some sort?).

    The fact that this only appears in one film would point towards it being a processing issue.
    But it's not 100% proof that it is.
     
  8. Shangheye

    Shangheye Member

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    I tend to agree with QG...a lightleak would appear as white, not a dark line like the one you show, especially since there are no signs of it on the rebate...most likely a developing issue, since the line is not well defined like a scratch. K
     
  9. Rinthe

    Rinthe Member

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    thank you Q.G. that was really helpful.

    Shangheye: I didn't say that the dark line is a light leak, i was talking about the lighter edges.
     
  10. bdial

    bdial Subscriber

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    Looks more like processing to me. What was your developing procedure? Also, have you verified that it's visible in the negative or only the scan?
     
  11. Rinthe

    Rinthe Member

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    invert 5 times every 30 seconds
     
  12. Shangheye

    Shangheye Member

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    Sorry for that misunderstanding...same point applies, if it is not on the rebate, it is unlikely to be a light leak...rgds, Kal
     
  13. Q.G.

    Q.G. Inactive

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    No, Kal.

    If it is not on the rebate, it could still well be a light leak.
    As explained, the typical dark slide slot leak can't reach the film under the edges that create the unexposed rebate, because it is under the edges that create the unexposed rebate.
    So it's not a good indicator.
     
  14. Shangheye

    Shangheye Member

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    Point taken QG...I have never experienced such a light leak, but I can see what you mean..K
     
  15. Sparky

    Sparky Member

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    I'd start by agitating way less... it could be the 120 equivalent of sprocket hole surge, being right next to a large area that is undevelopable (the clear border). Try agitating 1x per agitation cycle and then slamming the tank a little when you put it down. Most people overagitate and bring lots of problems on themselves...
     
  16. verney

    verney Member

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    Is there bare metal visible in the film back around the opening or perhaps in the camera body between rear curtains and film back? That could reflect some extra light to film.
     
  17. Rinthe

    Rinthe Member

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    No i don't see any metal. I will try to agitate less next time