Apug! This has likely been discussed in the past, but I could not find a clear answer in all the debating. My Mamiya RZ67 Pro ii produces beautiful negatives, but after scanning, I am not exactly clear on how I should be cropping. I, foolishly, entered 6 and 7 into Photoshop's custom constrain field, and while I love the ratio that gives me, I am loosing quite a bit on the edges. Meanwhile, if I go with 4x5, 8x10, etc. I get a ratio that fills the frame with the ability to go ALL the way to the edges on all four sides. This seems like the 'ideal format' in truth, but I can't help but wonder where 67 comes from, if that crop is such a slice on the sides. I'd love some history, or input. What do you guys do?