Dev time 400TX / Rodinal in a Jobo rotary processor

Discussion in 'B&W: Film, Paper, Chemistry' started by Fintan, Aug 12, 2004.

  1. Fintan

    Fintan Member

    Messages:
    1,793
    Joined:
    Jan 29, 2004
    Location:
    Ireland
    Shooter:
    Multi Format
    Dev time Tri-x [400TX] with Rodinal in a Jobo rotary processor

    Can anyone advise?
     
    Last edited by a moderator: Aug 13, 2004
  2. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,032
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
  3. Fintan

    Fintan Member

    Messages:
    1,793
    Joined:
    Jan 29, 2004
    Location:
    Ireland
    Shooter:
    Multi Format
    Thanks Ian, I did check this already.
    Agfa only give small tank times for tri-x, they do give rotary times for APX though, but its tri-x I need if anyone can help me.
     
  4. clogz

    clogz Subscriber

    Messages:
    2,842
    Joined:
    Dec 28, 2002
    Location:
    Rotterdam, T
    Shooter:
    Multi Format
    The rule of thumb with all sorts of ''rolling" processing is to take the recommended time minus ten percent. If you use a diffusor enlarger - you'll need a bit more contrast in your negs then - I always take the recommended time. It takes a bit of testing out.
    Some diffusors are softer than others.
    Regards
    Hans
     
  5. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,032
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    Sticking the various comparative times in a spread sheet shows that Agfa reduce the time by an average of 15% for Rotary processors and round up or down to the nearest minute

    This gives times for Rodinal of:

    Kodak Tri-X 1 + 25 6 min ISO 500/28°
    1 + 50 12 min ISO 500/28°

    Hope that helps, I do have a full Agfa data sheet somewhere for Rodinal which I know does have the times for a wide variety of films and includes Rotary processors. The times I've given are only rounded up by 3 & 6 secomds !
     
  6. Fintan

    Fintan Member

    Messages:
    1,793
    Joined:
    Jan 29, 2004
    Location:
    Ireland
    Shooter:
    Multi Format
    thanks guys