Couple of things, while you can calculate film speed by the .1 method with the BTZS, it is usually done by CI which IMO is more reliable.
Originally Posted by noseoil
Now, your apropriate film speed is also determined by the paper you use. For example, in my film speed and developing test using the BTZS with Pyrocat HD and TMY as well as Ultrafine (knock off Ilford) I got full film speed but since pt/ pd compresses the tonality so much when printing, I cut the speed in half, effectively moving all the values up on the curve one stop. So for me, "zone III" is actually 0.6 to 0.7 as opposed to the "Adams" values of .3 to .4.
Azo has a very good DR, in fact far better than pt/pd but from what I understand MAS develops his negatives to be very dense, which leads me to believe Azo might be in the same boat as pt/pd, since it has such a long range, perhaps using higher density values for the shadows might be a good thing.
IMO the object of testing, either by the ZS or the BTZS is not to obtain the thinnest possible negative with all the information, but to obtain information that will allow you consistently produce negatives with the desired information in them. With roll film it is important to get the thinniest possible negative to reduce grain, we dont have that constraint with LF.