Well, the "M" in the regular Leica M-Series means "Messsucher". The M in "MP" means "mechanical" (as in "mechanical perfection"). So based on that one could arg

Well, the "M" in the regular Leica M-Series means "Messsucher". The M in "MP" means "mechanical" (as in "mechanical perfection"). So based on that one could argue that the MP isn't part of the regular series :-)