Strange 8x10 Jobo Tank problem

Discussion in 'Darkroom Equipment' started by kenmeyersphoto, Mar 29, 2005.

  1. kenmeyersphoto

    kenmeyersphoto Member

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    I believe I have some sort of intermittent Jobo 3005 tank/8x10 film developing problem: I develop tmax 400 in abc+pyro/Rollo pyro. Ocassionaly I will find a faint line that will run at the bottom of the negative and it is approx. 3/16 of an inch into the image and runs parallel with the bottom of the negative. I am thinking it is a Jobo issue, but not sure. I will likely start to tray process negs instead if I can't nail down what is going on. Any help is appreciated.

    -Ken
     
  2. photobackpacker

    photobackpacker Advertiser Advertiser

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    Is the line on all negs processed? Is it a white line or a dark line? Is the line always at the notch end of the film? Is this a new problem?
     
  3. Bob Carnie

    Bob Carnie Subscriber

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    Ken

    are you using distilled water to mix your chemistrys? I had problems with edge lines in the past when running pyro without distilled water. These lines showed up as plus density on the print and were in the direction of the tanks rotation.
     
  4. George Losse

    George Losse Member

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    Ken,

    On the negatives with this line, is the line where the film had stuck up out of the hole?

    I had this problem with my first attempts at using pyro developers. I didn't realize it until I noticed that my 8x20 negatives had the marking of the inside of the tank, then I looked closer at the 8x10 negatives and found they did too.

    I will say that I have not had this experience with Pyrocat-HD, only with ABC and PMK which as I found out, were not designed for continuous agitation.

    Since trying Pyrocat-HD, I've had negatives that move inside the tubes of the tank and never had a development mark.
     
  5. kenmeyersphoto

    kenmeyersphoto Member

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    It is the opposite of the notched end. It is a slight density buildup-line. I hadn't noticed it until I started using a Jobo.
     
  6. kenmeyersphoto

    kenmeyersphoto Member

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    I have not been using distilled water.
     
  7. kenmeyersphoto

    kenmeyersphoto Member

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    I suspect that you are right.... I have developed some negs in Pyrocat HD and haven't noticed any problems. I do have the problem of negs creeping up out of the tube, but haven't noticed any problems with that. I don't know if I am crazy or not, but I seem to get easier to print negs with the TMY-ABC+ combo, but may need to switch to pyrocat hd.
     
  8. photobackpacker

    photobackpacker Advertiser Advertiser

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    I have seen slight density build-up lines caused by reflection in the camera. An easy way to determine this is to do everything the same but load the notched end of the sheet into the drum first, obviously making sure the emulsion is still facing inward. If your line stays oriented opposite the notched end, it is a reflected light issue. If it moves, it is a development issue.

    What rotating speed and development temp are you using?
     
  9. Bob Carnie

    Bob Carnie Subscriber

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    If the line is in the parallel with the rotation , I strongly urge you to use distilled water. It may be a laminar flow pattern that shows itself close to any edges of the film approximatel 1/16-3/16 into the edge of the negative. when you print this it will show up as a faint white line. This problem will not show up on complicated background, but will rear its ugly head in skys or nuetral backgrounds.