adjust dvt times from tank to btzs tubes

Discussion in 'B&W: Film, Paper, Chemistry' started by zonesys, Jun 30, 2005.

  1. zonesys

    zonesys Member

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    Hello,

    For my 4x5 sheets development, I'm going to go from tank process to btzs tubes.
    Does anyone know a "rule of thumb" to start test to adjust tank dvt times already tested to btzs times ?
    Thank you

    zonesys
     
  2. noseoil

    noseoil Member

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    Best guess is to decrease development times if your are using gentle agitation in tubes. I would try about a 20% drop in times, as the rotary action seems to be much more active than trays and tanks. Use a known value for exposure and SBR then tailor your contrast accordingly. I know you'll like it once the change is made. tim