I recommended Pan 50 120 size to a student who wanted maximum detail from her 16x20 enlargements. Now I'm feeling a little bad, because Delta 100 or Acros may be more flexible and forgiving, right? She's not a spot-meter and densitometer-checking type, after all. In any case, we work with Ilfosol, which gives a recommended 4 minutes at 1+9-- way to short for even development, right? 1+14 gives a more manageable time, but Ilford emphasizes that dilution as economy, not quality. Of course, half the searches I do for Ilfosol say it's garbage anyway. I have a couple bottles of Rodinal lying around. Manufacturers give a time for 1+25 dilution, but other forum posts say Rodinal doesn't get interesting until you dilute it more. So perhaps we should shoot at 25 to give her extra shadow 'safety', then pull back the highlights with a higher dilution so they don't get blocked? I'm worried about using Rodinal for the first time because we're talking about mere millilters, right? Am I going to run into streaks or developer exhaustion? We use Patterson tanks, and most students agitate by inversion, which seems counterintuitive to me-- the solution will just slosh back and forth into the funnel mechanism, and you're going to lose some of it. The twisty method--moving the film within the developer instead of sloshing the devloper around, with all the attendant debate (how many times? how vigorous? how quickly?)-- seems better to me. But my first experiment with it, also my first with Rodinal 1+50, and plenty of solution, left the first frame or two with streaks. What in any case is Rodinal effect that makes so many people love it? It must be the tonality, because the Acu-suffix, and F39 developers, etc. are much, much sharper, right?