I'm planning on calibrating several 35 mm films that I'm working with to four developers that I work with as described here : http://www.apogeephoto.com/mag2-6/mag2-6mfcalib.shtm. If any one has any suggestions to the methodology that I referenced or any suggestions I'd appreciate it. One of the 35mm films that I shoot is Tmax 100. I also shoot Tmax 100 in 4x5 large format. Does anyone have an opinion as how my results from 35mm format might equate to the 4x5 format with identical developer, time, temperature and paper ?