Hi,
I see your point on extenders. The reason I mentioned the Leitax is because adapters add a level of extra tolerance and the Leitax does not.
There is an adapter for R-lenses on the Leica-M.
Two other issues I would like to point out. First I don't think that EVF really works well for unmagnified manual focus. I have never been good at manual focus and I always focus at 11X when I focus manually. I don't think peaking works at all on Sony, it shows some kind of sharpness indication but if I focus by peaking I never get anything decently sharp. I guess magnified live view is not so good for subjects in motion. Obviously, there are shooters who focus exactly with optical viewfinders, but if that works with an EVF may be a consideration.
The other point is that I feel that removal of OLP filter is not a very good advice, especially not with very good lenses. The OLP filter looses some edge contrast, but that can be restored with a bit more sharpening. The reason the OLP filter being there is to avoid aliasing, mostly colour aliasing but also monochrome. The best way to avoid aliasing is OLP filtering with more pixels.
The enclosed shot was made with a Hasselblad Sonnar 150/4 on a P45+ at about three meters. There are a lot of aliasing artifacts in that image. I also got aliasing with a Planar 80/2.8 at the same distance. The red boxes show what I feel is obvious and bad aliasing. The second image is shot from the same position with an Sony 70-400/4-5.6G at 150mm on my Sony Alpha 77 SLT. The lenses are pretty well matched, with the Sonnar probably having some edge, but the P45+ has 6.9 my pixels and no OLP filter while the Sony Alpha has 3.9 my pixels and OLP filter. The Sony Alpha image was downscaled to the same size as the P45+ image using Lanzos which adds relatively few aliasing artifacts.
The original series also include an image taken on the Alpha 99, 6 micron pitch with OLP filter. I think what is obvious is that small pixels are what really help.
http://echophoto.dnsalias.net/ekr/Articles/MFDJourney/FakeDetail/comparison1.htmlBest regards
Erik
There are no replacement bayonets for the lens side of the Leica-R extenders. Canon's 36MP, no AA-filter model is... ?