So all along I thought my probe was nuts. No matter where I put it on the neg - it was never right. I thought it was maybe the 50mm lens for my 35mm negs (vs. my 80mm lens for MF or my 135mm lens for using my nifty new contact enlargement thingy ma bob). So today - I was printing some proofs for a friend and was using RC paper instead of my usual fiber paper (all Ilford) and voila! the probe was DEAD ON with three different negs (two HP5 and one TRI-X). So is my probe set up for RC paper printing times or what? I print both, so don't mind it working for RC, but is there a formula I can use to get it correct (like 2.5X factor, which was kinda ballparking it for me before with FB) with both?