After several years of serious shooting, I've never done a film speed test. I do not have access to a densitometer. Up 'til now, I've typically pulled one stop, reduced dev by 30%, and gotten decent results. However, I want to give testing a try. Today, under an even gray overcast sky, I exposed a roll of Classic 400 roll film at 4 different speeds: 400, 320, 250, and 160. I exposed 3 frames at each speed: as metered (i.e. zone 5), -4 stops (zone 1), and +3 stops (zone 8). Most of the articles I've read say that, after processing the film, I want to look for a zone 1 frame that has "slightly more tone" than the clear leader. Could I not use my light meter to help with this? If I meter through the clear leader (i.e. film base and fog), then look for a zone 1 frame that is 1 stop more dense, am I on the right track? Pyrocat HD: I plan to take the Formualry PMK times for Tri-X (14 min.) and HP-5 (13 min.) and call it 13.5 minutes for Classic 400. Then, knock off about 20% for Pyrocat HD.