In truth the viewfinder of a Leica is not so precise that the edges are certain. Different focal length Leica lenses, particularly the wides, actually deliver different size images on film! Similarly 35mm SLR's (Nikon F, WL finder excepted) often show 90% or less of the image that will arrive on film. Different focal lengths offer no salvation. So it is odd that the "don't crop" people insist on keeping edge details they never saw as validation of their skills. And don't get me started on people who file out negative carriers and include "verification borders" real or faked to "guarantee" the integrity of their art.