Where did you get that SS? I don't see it on B&H's list, or in "The Fil m and Feveloping Cookbook" (Anchell & Troop, Focal Press, 1998.) They do list a lot of other films. Development times with Xtol 1:1 at 68 degrees F for the following 100 speed films: Delta 100 10.5 min; TMZ 9.25 min; FP4+ 10 min; APX 9.75. Depending on the contrast range of your scene, looks like you could start with 9 or 10 minutes. By the way, I love that book, and recommend it highly. Regards, Phil(posted 9268 days ago)