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Hi Elliot
I don't know why, but it would be difficult to do a pre-soak (and complicate the procedure) with the BTZS tubes and with the initial shaking for about 10 seconds of the tubes the developer covers the area of the film and development is very even, which is the main reason he came up with the tubes for processing sheet film. He was not satisfied with the even-ness of development of sheet film in a tray.
With the Jobo 3000 series tanks - it takes a while for the developer to be poured into the tanks, so a 5 minute pre-soak is recommended.
Please note with the same film and developer combination - test results can differ for the BTZS tubes and Jobo Tanks. I found that out when I tested 400 T-Max-2 (4x5 film) in the BTZS tubes and Jobo Tanks. My usual dilution for Ilford DDX is 1+9 at 75 degrees. It worked fine with the BTZS tubes but had to go to 1+12 in the Jobo tank to get similar results.
In the near future I will be retesting a number of films with both the BTZS tubes and Jobo tanks and I'm quite curious what the results will be.
For those not familiar with using the BTZS tubes please see my video on youtube.com, in 2 parts. It had to be in 2 parts because when the video was done there was a 10 minute limit on videos. To find the videos please do a search on the word "viewcamerastore".
Fred
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