So, a two-part question based on some experiments this weekend. I've only been back to printing for a month and honestly can't remember how I used to print based off contact sheets before. 1) Let's say I have the exact same paper for contact sheets and 5x7s. If I can see that a frame looks perfectly exposed on the contact sheet, is there some formula to figure out the same exposure for 5x7 without having to do test strips? 2) OK, so I DON'T actually use the same paper for contacts. It should be possible to get an exposure that looks exactly the same as my contacts on different paper though, right? Most of my negatives on the contact sheets--of course unfiltered--had a pleasing medium contrast. I had difficulty replicating this in 5x7...looked muddy. Needed to add filters. Some of the contrastier enlargements look fine, but when I go back to the contact sheet I realize I still prefer the lower contrast of the contacts. I'm going to try to reprint a few this weekend, but since it was bugging me...is there any reason that the same level of contrast/exposure cannot be easily replicated from contacts to enlargements?? Or is my eye fooling me, and what looks like medium contrast is actually much lower, and simply works at 35mm size but not at 5x7 or larger?