Using R Glass with the Leitax conversion is just like using any non-chipped lens of any manufacturer on the more modern Nikons (I use a D300). For instance I often use an M Elmarit 90/2.8 in a Visoflex mount or with bellows on the Nikon, as well as a 400/6.3 Telyt. As mentioned earlier, there is a menu which holds 8 or so non-chipped len's info, which you can change on the fly quite easily...it references the attached len's focal length (approx in some cases) and the maximum aperture. You set your shooting aperture just as you ordinarily would, with the aperture ring on your lens. Of course metering is conducted in the stopped down mode for most non-Nikon lenses, and you must stop down the lens manually before shooting.The camera meters the scene in in the mode you've chosen, for either manual or aperture priority shooting modes. You have the capability, if you really need it, to view the histogram as well each of the color channels on the back. Generally I've found that the metering is extremely accurate and the histogram isn't needed. I haven't converted any R lenses for use yet, as I can use them as they are on a Sigma digital body I had swapped the sigma mount for the Leica R mount on before I picked up the Nikon. I admit, I'm using film a lot less these days with my R lenses. ------ Unsubscribe or change to/from Digest Mode at: http://www.lrflex.furnfeather.net/ Archives are at: //www.freelists.org/archives/leicareflex/