Can't say it would provide better tones, but a lower EI will give you greater shadow detail and separation. But, that may not be what you're looking for, though. Try shooting the same image at both EI 50 and EI 100, develop together (if possible), and decide which you like better.I quite like it myself I have to admit. However, that was shot at box speed and seems fine. If shot at 50EI would give even better tones you reckon?!
I really appreciate your thoughts and the time you spent to offer me these infos.John, I'm a sort of lapsed disciple of the Zone System that means testing to get the optimal negatives from a film/developer combination for printing on a chosen paper (& grade). By lapsed I really mean I'm not obsessive.
When I first used Foma films I was living abroad and didn't have a darkroon, however I still did some visual testing, and on my next trip home my films printed easily on the same grade as others like Tmax 100/400, Delta 100/40.
The idea it to have negative with good tonality, you can then print them in many different ways rather than being at the mercy of negative that's difficult to print. Foma films are rather odd ball in the way they build up contrast very quickly but they are good just needing that extra care.