adjust dvt times from tank to btzs tubes

[zonesys]

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

 

[noseoil]

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