I already searched the archives and didn't find out exactly what I wanted to know, at least specific to my materials, so I thought I'd post a question. Anyway, my photo professor this quarter requested that the members of the class switch to some kind of tank or tube for processing film this quarter. Because I intend on buying a Jobo processor for doing my roll, 4x5, and color stuff in the next year or two, I went for a Jobo tank instead of trying to dig up an old Unicolor or Omega drum. Can't afford an Expert drum at this point, though, so I bought the 2509N 4x5" reel and the appropriate tank to hold it. In my preliminary test (singular) I found agitation to be fairly consistent, but not completely. This spawned some questions. I searched the archives, read many an old post, and still have these questions:
1. Rotation speed: posts have indicated rotation speeds from 35-75 RPM, both extremes indicated as giving even development. Do the pysics of it all point to one end or the other?
2. Ratio of rotation and reversal. Would the number of rotations in any given direction prior to reversal of direction affect consistency of agitation? This assumes equal number of rotations in every cycle.
3. Developer. I currently develop in HC-110 Dilution B, my film being TMax 100. I like the results I get with HC-110 tray processing, so that's why I'm using it with the drum. However, would choice of developer affect how even development is? Would I have a better chance of getting even development if I went back to TMax RS?
4. Presoak. I have received conflicting reports about the importance of a water presoak. I usually presoak for about 2 minutes with all my film. Any difference using the Jobo drum?
As I stated before, the materials I am currently using are TMax 100 4x5" sheets developed in HC-110. I have TMax RS developer readily available to me. I do not currently have a Jobo processor to automate things, so I currently use the little roller base and roll by hand, though the roller base isn't ideal considering the "stubby" dimensions of the tank. I'll keep developing the important stuff in trays until I get this resolved. Any thoughts regarding the 4 questions I posed or any general suggestions for maximizing my chances of even development would be greatly appreciated. Thanks.
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