I recommend EI50 for this film. For rotary development, either Xtol 1+1 for 8:00 or D76 1+1 for 9:00. The Xtol probably achieves ISO100 though I haven't measured properly.
As to your "compare it with others" question, it's nowhere near as fine as TMX but then this is 4x5 so diffraction is likely more limiting of your resolution. It's similar to FP4 in terms of grain obtrusiveness, maybe a little coarser. Which is to say 'completely invisible in a 16x20" print'. For a really rough comparison, there's about as much information in a 4x5 Foma100 shot as a 6x7 Acros shot; a 4x5 Foma100 is visibly better than a 6x7 TMY2@800 under close inspection but there's not a lot in it. The Foma/Arista 200 is far coarser.
Here are my samples in 4x5 (Foma 100) and 6x7 (Foma 200). It's been my most-used film in 4x5; after all it's damn cheap and given the optical limits of the format, you're not going to see much (any?) smoother results from better films. And the tonality is great.
The only big drawback for me is that it has terrible reciprocity failure. I wouldn't ever bother shooting night shots with it and it's annoying even in early evening when you're getting meter readings of 2s-4s.
Last edited by polyglot; 10-12-2012 at 01:34 AM. Click to view previous post history.