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Back then, at the end of R camera and lens production, we were promised a "new" R camera to replace that well-loved camera and its lenses. The SL can mount R lenses and it can help you focus a MF R lens with Live View and the joy stick enlargement. But mounting an R lens on an SL is only half of providing an equivalent R camera. The MF experience is a two-fold hand and eye operation: focusing the lens by hand AND using a split-field viewfinder to focus it. That latter step is not now available for the SL, but could be furnished very simply. In AF mode, the SL sensor gets light through the mounted AF lens, detects the degree of un-focus (the error signal), and issues commands to the lens's motor to focus it. With a MF lens attached, everything is the same except that the commands have no where to go and are not used. To me there is a simple way to use that degree of un-focus (the error signal) with a MF lens. Let it drive a computer- generated image of a split-field viewfinder. As the MF lens is focused by hand, in lieu of a motor, the state of focus would be displayed as if there was a real, split-field optical viewfinder in use. Thus the eye-hand manual focus of the R camera would be preserved in the SL, or other AF cameras that can mount a MF lens. Think about it this way: Simply replace the motor focusing an AF lens with a hand focusing a MF lens, guided by a synthetic computer-generated split-level display in the Electronic View Finder. With this bit of digital skullduggery, any AF camera with an EVF which can mount a MF lens can be used exactly like any MF camera with a split-field rangefinder. I hope Leica will provide this feature in the near future so that R lens fans can use their MF lenses with an SL body just the way they used them on an R camera body.