Re: R to M adaptor?
Yes they work. Unless you are doing something unique, I don't think they're worth the effort. By way of example, I posted in another forum several years ago, something I tried quite successfully. I mounted an Adaptall Tamron 70-210mm zoom to a Leica R mount, attached that to the R to M adapter, then mounted it all on an M6 ttl. The lens has built in autofocus and batteries, so I knew the picture would be focused. I used the 90mm viewfinder frame for the low end of the lens zoom and the rangefinder box for the long end. The M6 provided ttl metering for exposure. The shots I took were quite crisp and contrasty, but not quite up to Leica quality in the corners. I've had very little other use for the R->M adapter since then, because of the need to hit focus right on the button with lenses wide open.
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