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Thread: film hangar flow pattern

  1. #1

    film hangar flow pattern

    I have noticed streak marks in areas of smooth tone that correspond to the drain holes in the bottom of my film hangars. Reducing agitation and presoaking create mottling.

    I have been using D76 undiluted and HB110 b with 4x5 FP4+.

    Based on past studies, this is most likely coming from the the initial immersion when the turbulance at the hole location causes faster local absorbtion of developer. Later immersions contribute also.

    I have tried slowing the rate of immersion to no avail.

    Will increasing the developer dilution mitigate the problem or are there other solutions such as maybe a two part developer.

  2. #2

    Join Date
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    film hangar flow pattern

    presoak the film in plain water for a minute or two before the developer stage. Doing this will require longer development times to compensate for the slower absorbtion of developer into the film because its full of plain water.

    note that some people are anti presoak because, they say, developer take up is more even from unsoaked film. Others say developer take up is more even if film has been presoaked. Take your pick.

    Try it and see if it solves your problem.

  3. #3

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    film hangar flow pattern

    I frequently use D76 1+1 with hangers and HP5+. I never have any streaking. I agitate initially for a full minute, but initial immersion is straight in, very quickly. I agitate by bringinging the hangers up, tip 45 degrees to the right. Submerge, bring up and tip 45 degrees left. Submerge, continue. The only streaking problems I've had with any film/developer combination were when initial agitation wasn't long enough.

  4. #4
    Whatever David A. Goldfarb's Avatar
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    film hangar flow pattern

    I agree with John Sarsgard. The solution for this problem is more vigorous agitation, not less. If you're trying to do some sort of minimal agitation or stand development, maybe try John's suggestion at the beginning before letting it stand.

  5. #5
    Abuser of God's Sunlight
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    film hangar flow pattern

    some film/developer combinations are more prone to streaking than others. one of the reasons i switched from agfapan/d-76 was constant problems with edge density buildup.

    if you can't solve the problem by tweaking the presoak/agitation, it might be worth looking at different chemistry.

  6. #6

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    film hangar flow pattern

    I had issues with uneven development, and surge marks as well when I first started developing sheets with hangers and tanks. After increasing agitation, these marks went away, and I now get very even development.

    Perhaps you're being *too* gentle, and need to increase turbulence in the developer - you want random motion in the developer, so don't be afraid to be a bit more agressive when you develop - witin reason, of course!

  7. #7

    film hangar flow pattern

    Thanks all.

    I photographed a 2x4 foot white plastic panel exposed to middle grey. Cut the HC110 B with an equal amount of water and increased time 50%.

    I also increased the the agitation to about 10/12 in and out cycles that took a minute to complete. Immersions were fast, not slow.

    Don`t know if the more diluted developer solved the problem or the longer first agitation cycle that John Sarsgard suggested, but the problem appears to be cured.

    The next step was to be DK 50 which was a common developer for deep tanks.

  8. #8

    film hangar flow pattern

    I use the hangers when I have a lot of film to develope. I've had no problems with it at all. Presoak. Then initially agitate for 10 secs then drop in tank. Wait a minute and then pull up, tip to the side and drop back in. 30 secs later pull out, tip to the other side and drop back in tank. I do this throughout my development time and then pull and drop in plain water and agitate the s*#t out of it for 30 secs. If you want, pull out every 60 secs. Depends on how much development you want and how much contrast you desire. I occasionally hear about streaking but I've never experienc ed any nor have I ever seen any. If you want less contrast, then don't scimp on agitation but dilute your developer more.

  9. #9

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    film hangar flow pattern

    I had found density build up on edges with Rodinal on 8x10 Tri-x. I went back to D-76 at 1+1. For deep tanks Kodak says agitate continuously for the first 15 to 30 seconds by raising and lowering rack 1/2 inch. Do not agitate for the remainder of the first minute. Then agitate once per minute by lifting the rack out of the developer, tilting it approximately 30 degrees, draining it for 5 to 10 seconds, and reimmersing it. Alternate the direction of tilting the rack.

    Note; I think this is pretty easy agitation, and it works very well. I do use a presoak of about one minute.

    Check, www.kodak.com/global/en/professional/support/techpubs/f9.

  10. #10

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    film hangar flow pattern

    A neat habit to get into when using hangers is to load the film with the notch code up. Since most sky shots are horizontal, this places the sky away from the hanger holes.

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