I've noticed there are 2-CAM and 3-CAM lenses. Not sure what this means, but are there any limitations to using all R lenses on the M240? (with proper adapter of course)
Would like to get some macro and telephoto capability at those R prices.
D
This site will fully inform you about the Leica R lens cams:
http://www.photoethnography.com/ClassicCameras/Lens-R.html
The Leica R cams (and ROMs) are all bits and pieces of the mechanical and electronic interface that is needed for SLR camera functionality. None of it is needed or gets in the way of using Leica R lenses adapted to Leica M or other mirrorless camera systems. All Leica R lenses fit on an M or mirrorless body as a simple, manually operated lens, with whatever adapter.
The major advantage of using the Leica adapter for R to M is that it will enable the M body to list the lens correction profiles that Leica has included for the R lenses. Not really a big deal IMO, but some people like what they do.
As to what R lenses to use on a digital body, well, the most recent R lenses are definitely superior in some ways to the earlier ones, but whenever you hear that it's important to realize that even the poorest of Leica R lenses are about as good as the best of any other SLR lenses.
I have acquired a nice little collection of R lenses, about ten in all, that span from 1965 to 1983 production series. Most of mine are 3 cam models, so they're compatible with nearly all Leicaflex and Leica R bodies. I use them mostly with a Sony A7 body on a Novoflex NEX/LER adapter. They produce outstanding results, every one of them. My favorites are the Summicron-R 50mm f/1.4 and the Summicron-R 90mm f/2, although all are great.
I've seen results using them on the Leica M as well, they work just as well on its sensor as on the Sony A7.
G