Partially underdeveloped picture?

Discussion in 'Film and Processing' started by alvin_lim|5, Nov 14, 2010.

  1. Just developed a roll of Ilford HP5+ today and there were a few shots from the roll that seemed partially underdeveloped.
    Not sure that is the problem is because the other roll in the tank turned out fine. Wondering if anyone knows what happened. Thanks!
  2. Same camera for both rolls? Was that the top or bottom roll in the tank? What was the developer? What was the dilution? How much developer was in the tank? What type reels and tank? What is the amount needed for 2 rolls with that tank? We already know the film so there we start figuring it out.
    First guess is the shutter is capping if it is a vertical shutter.
  3. Was the tank level? An out-of-level tank can cause such problems.
  4. Not sure if it is the top or bottom roll but the developer is HC-110 and dilution B (1:31). Water temperature was 20 degree celsius and developed for 11 minutes (shot at ISO 1600).
    The tank and reel are the AP plastic developing tank and the mixture was 650ml (which is the recommended).
    The camera that I shot with was the Nikon F3HP with the Ai'd 35mm f2 with a lens hood. I believe that these were shot close to 1/2000s as it was pretty bright that day. Not much choice as I was shooting a lot indoors and these are the few outdoor shots.
    The tank was definitely level.
    The thing is that I reused the same chemicals in a Patterson tank and the pictures were fine. This is the first time I am experiencing this so I am pretty curious to know what happened so that I can avoid this from happening.
    Hope this is enough information. Thanks in advance!
  5. I bet the camera is capping at 2000th of a second and I never reuse HC-110 as I prefer it as a one shot then I know that all is good there.
    Yep the old girl may need a CLA on the Shutter or just exercised more at 2000th of a second as that is a speed that most likely does not get use enough with your shooting style. You may want to look into that.
  6. Thanks Larry! You did nail it as I hardly ever shoot at 1/2000 or 1/1000s. Usually try to cap it at 1/500s so guess it might be the problem. Thanks again!
  7. Further support for a shutter being the problem. In the day when it was relatively new, my Pentax H2 would show this symptom after a year or two of use. Occasionally, other cameras will show similar problems. Often all is needed is to exercise the less-used speed a lot and the shutter will loosen up and return to function.
    Of course, this supposes that this is a focal-plane shutter, otherwise, it might be development or something else.
  8. Thanks JDM! Will exercise the speeds and hopefully the problem will not resurface when I use the camera at the speeds again.
    The Nikon F3 does have a horizontally travelling focal plane shutter.
  9. Well as I like to say here. Another mystery solved. Yes just do like I do and sit while watching TV and exercise the shutter at the suspect speeds for 20 minutes to 1/2 an hour.
  10. Yes, although I never have had the problem with any of my Nikon cameras, as I said, the Pentax needed to be serviced about every two years. When I bought a Asahi Pentax H2 (really) it came with the same problem. On the vertical metal shutter on Praktica L series cameras, I have had the top speeds show uneven exposure out of the 'box', but on those the "exercise" works fine. In desperate circumstances I have introduced an almost microscopic amount of naphtha into the shutter channels and it has helped loosen up accumulated stuff.

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