I have a PDF on how to professionally shoot paintings and print art reproductions. Anybody who is interested can drop me an email and I'll send it to you. I'm in a different time zone than most, so be patient.
printmaker@hawaiilink.net
Oh yeah, my lenses for shooting art are a 150 Rodenstock Apo Sironar S and a 210 Schnider Apo Clarion. Occasionally, I use a 60 Micro Nikkor. As far as Leica goes, a long time ago I would unscrew the front of my 50 Summicron and mount it on a bellows and then onto a visoflex. It would be a pain, but today I could use a 50 Summicron on a M8, but only for art over 20x24 inches.
Tom