There is a test you can do and it is usually shooting a white wall at 4 stops under and 5 stops over the meter reading. When the film is just barely dense you've got it. I'm not going to explain it, but it is in at least 3 books. Then you figure it out with your development. For instance, my 240 Schnider has such a slow shutter it is 2 stops over, and my little Ektar is fast. Then you fudge. If you run the test you always know. Lots of people hate calibrating, and I'm not Zone calibrated, but it sounds like you need at least a fudge calibration. Dean