I am wondering about the comparative speeds of medium speed films (~100-125 iso). FP4+ Fomapan 100 Efke 100 Delta 100 TMAX 100 Plus X Neopan 100 Acros 100 (Have I missed anything?) I am not asking about the absolute speeds (e.g. is TMAX 100 really 100 iso?) What I want to know is the relative speeds (e.g. Fomapan 100 is half the speed of FP4+, or whatever.) Any comments? Just for sake of argument how about if we peg everything to one or two films, such as FP4+ and TMAX 100. Thanks.