I guess I should clarify. Before my M I used a early Canon rangefinder that was very similar to the early Leica but better in that the rangefinder patch was also in the viewfinder. Anyway, the edges were so fuzzy I was largely shooting high powers of intuition as to edges of my composition. So then I got the M with it's nice bright line squares and took off for two months out west and Mexico. When I got back I wondered why I was so sloppy in compositions done at infinite focus. While reading another Leica discussion list someone pointed out how drastically the angle of view opens up on a 50mm lens compared to focusing at .7meters, or even from 15 meters on out. The degree of change for a 90 lens apparently opens it up to a 75mm frame. So suddenly it all made sense to me and I took out my poor old canon slr and saw that by golly, the 50 opened up almost halfway to the 35 frame.
So since then I have maintained this fact in my shooting consciousness and shot tighter or looser accordingly. And now I'm just thinking it would be easier to shoot at infinity as tightly as I like if I had an accessory viewfinder that could give me the proper sized frame.
I thought of cropping, but I would lose negative space and I really really like printing the black borders. More importantly is that I would go totally neurotic doing edits and I'm neurotic enough : )
I'm curious if anyone knows if the nifty looking voigtlander brightline finders are adjusted with a square sized for infinite or closer. It is my guess that it is sized for close so that one can crop excess rather than inadvertantly leaving content out of a closer focus shot.
And I know that the Leica Imarect finder that they used to make is infinitely adjustable from 28mm to 135 with click stops. My thought would be to find the proper sizing for 50mm at infinity and then make a mark and hope that it stays there without having it's own click stop.
I hope this makes sense and I really appreciate any advice, thanks