Thanks for the information. They list adapters for R lenses here. I was looking for possibly using an M mount lens, or an older Ltm screw mount. ...
Does anyone know if this would work- an M mount lens on a full frame sensor style camera? I imagine it does because they sell M mounts for Canon Eos cameras.
It cannot work for M mount lenses, because their flange-to-focal plane distance is less than that for the Sony/Minolta alpha mount, while to work with an adaptor (without added lenses in the adaptor), that distance has to be more for the lens than the body's mount, by the thickness of the adaptor.
The M-to-Canon adaptors are for the new mirrorless EF-M mount with a far lower flnage-to-focal distance, not the EF or EF-S SLR lens mounts.
Some details here:http://en.wikipedia.org/wiki/Flange_focal_distance