I used to shoot chromes almost exclusively so I got used to always framing exactly how I wanted it to look since masking slides is a PITA and so is doing duplicating work to do crops though I would get out the bellows and slide dupe rig if I really needed to do a crop. I find, no matter the medium, that a picture obviously looks better if you don't have to crop and enlarge the image any more than necessary. Hence the 300mm and 100-400mm lenses in my arsenal which are NOT just for wildlife and sports, I often do tight landscape framing as well.