Tech Pan Wrong EI

Discussion in 'B&W: Film, Paper, Chemistry' started by Annie, Jun 15, 2004.

  1. Annie

    Annie Member

    Messages:
    273
    Joined:
    Mar 29, 2003
    Drat!!! I just exposed 10 sheets of TP4415 thinking it was TXT4164 so it was rated at 200ASA... very underexposed from my usual 32ASA with TP which I usually soup in very dilute HC110 using stand development. To compound the problem the images on the film are of a high contrast scene..... Any suggestions of a development technique I could use to salvage these negs?

    Cheers & Thanks..... Annie
     
  2. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
    Most approaches I can think of require mixing some chemistry and all would require testing.

    Here are a couple of no-mix exceptions (that would still require some testing).
    (1)Kodak D-19 - 2 to 8 minutes at 20 deg. C.
    (2)Diafine - 3 minutes in "A" 1 minute in "B" (you can make your own "B" bath for more control).
     
  3. Eric Rose

    Eric Rose Subscriber

    Messages:
    4,442
    Joined:
    Nov 21, 2002
    Location:
    Calgary AB,
    Shooter:
    4x5 Format
    I have been playing around with TP in PyroCat-HD. The IE I have come up with is 75asa, 1:1:100 dilutions developed for 8 minutes. Normal agitation. Looks really good with great tonal range. I tried some at 400, 200, 100 and 50 asa. The 200 asa stuff was a bit thin but printable. For PyroCat-HD at 200 asa I would probably go to 11 minutes.
     
  4. ian_greant

    ian_greant Member

    Messages:
    405
    Joined:
    Sep 18, 2003
    Location:
    Calgary
    Shooter:
    Multi Format
    I ran a roll of TP through at 25, left in the camera for a month then finished the last two shots exposed at 1600 (whoops.. thought I had tri-x in there) 12 minutes in Pyrocat and they were too dense.. printable but on the thick side. Looking at them you wouldn't know I'd changed the ASA.

    I haven't printed them yet some I'm not 100% about them.. but they look ok (contrast/grain/etc) too Dense to scan though.
     
  5. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
    I have not found a dilution/time combination for Tech Pan in Pyrocat-HD that I like for general purpose photography. I seem to either end up with too dense and too contrasty or not dense enough - and have not found a middle ground yet. Earlier (on another APUG thread), I posted some of densitometry results with TP development experiments.

    I have been shooting Tech Pan for many years (35mm, 120 Roll, 70mm roll and 4x5). I have tried a lot of developers and my all time favorite is Bill Anneman's Perfection Micrograin - which is no longer commercially available.

    There is a Glycin formulation that specifically targets TP and I will be mixing and testing that one soon.
     
  6. colrehogan

    colrehogan Member

    Messages:
    2,016
    Joined:
    May 11, 2004
    Location:
    St. Louis, M
    Shooter:
    Large Format Pan
    Any chance of a link to that thread? Any of you using these TP negs for alt-process printing? If so, have you used D76 for developing negs for this purpose?
     
  7. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
  8. Annie

    Annie Member

    Messages:
    273
    Joined:
    Mar 29, 2003
    Tried XTOL straight with stand development..... some shadows are a bit thin (...read light sucking black hole) but there is very good highlight separation. I think I am going to try the XTOL with some negs shot at my usual 32ASA... seems to have potential.

    Cheers & thanks
     
  9. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
    That's on my "to do" list also, Annie. Let us know how it goes.