Thanks Ian. I've just checked if there is any data on the Foma Bohemia site - lazy me - and they do list the time for Perceptol but they don't mention at what exposure when it's obvious from the graphs on the second page of the document that only Microphen and Xtol can reach the speed of ISO 100 at gamma 0.6.
Miha, you might notice there's a rather large difference in tonality between the example I posted and thise earlier in the thread. Foma films are rather contrasty and they tend to build this up rather quickly so you need to make sure the negatives aren't over-developed.
I did some simple Zone system tests when I began using foma films and later some reciprocity tests, i foindthe films far better than Foma themselves suggest.
I love the look of Fomapan 100 in P-cat HD and PMK Pyro. I've been shooting it for several years in all formats, 135, 120, and 4x5. This is 35mm in PMK Pyro
If you want to reduce the appearance of grain, shoot scenes that have high-contrast lighting, lots of fine detail and no subtle gradations. Anything where you need to boost contrast (whether it's through increased development or high contrast paper) will show more grain.
I've been shooting Fomapan 100 in 4x5 for last few years with D-76 1+1 as a developer. I haven't tried any other developer, but to be honest I wouldn't expect too much. Fomapan is just OK for me - nothing more, nothing less. In 120 format I use FP4+/HP5+ with D-76 1+1 and I love them. If the price would not be the key factor, I would do it also in LF. In Poland, where I live, price of FP4+ per sheet is almost 3x higher that Fomapan...