I've got a dilemma I hope you can help me out with. I've done an enormous amount of shooting last year and I have a freezer of about 50 120 rolls of exposed film. I've been getting up extra early to develop a roll before I head out to work and then I soup another roll when I get home in the evening. However, I'm still shooting a lot so it seems like my freezer is 2/3 full with film all the time. So I want to start developing two 120 rolls in a tank. I usually use a steel 16oz tank for a single roll. I have a taller steel tank that will hold two 120 reels and one 135 reel (as a spacer) on top. I find that 800ml of solution will cover the reels and still leave (I hope) enough space above for adequate agitation. Has anyone used Rodinal 1+100 for two rolls? I know there are those that feel 5ml of rodinal isn't enough for one roll but I like the results I get with Pan F+ and Acros 100 at this dilution. I use standard agitation - constant agitation for the first minute, then several inversions every 30 seconds. I've had problems before developing two 135 rolls in the past however. I was souping two 135 rolls of Tri-X in HC-110 I+50 in my 16oz tank. I would often get built up density along the edges. With some advice I learned that I was filling the tank to the brim which was defeating the whole point of agitation. I worry though that the bottom roll will get less agitation then the top roll. I also have an issue of "Darkroom Photography" from the 1980's in which a pretty thorough test of agitation was carried out on 100 rolls of Plus-X and D-76. I have to dig up the issue but I seem to recall that the test results proved that developing multiple rolls in a single tank can create problems with streaking, uneven development etc. So I'm reluctant to try this until I hear back from some of you more experienced folks. The impression I got from the artical was that in general, it's safer to develop one roll per tank at a time. However the thought of getting 4 rolls developed per day rather then 2 is very appealing to me. So in nutshell:
1) Can I use Rodinal 1+100 for two 120 rolls? If not will I get the same results at the 1+50 dilution for two rolls that I would get with one roll at the 1+100 dilution?
2) Can I use 1+100 for two 135 rolls in a 16oz tank or would the taller tank be a better choice. I understand that a 135 roll and a 120 roll is the same area of film, but the taller tank will give more room for agitation.
Once I catch up on this backlog of developing, I'll probably go back to developing single rolls at a time. For now though I just want to be able to put food back into my small freezer! Thanks for replies.