The Leica R-Adapter L enables the use of 43 different R-lenses with the SL camera. This wide range of legacy Leica lenses that are now compatible with the Leica SL date back to 1976, and are once again usable with a modern Leica thanks to this new adapter. With this adapter mounted on the SL camera, the adapted R-lens maintains its original focal length. For instance, a 35 mm R-lens remains a 35 mm on the SL.
The Leica R-Adapter L cannot read the selected aperture set on the lens. Instead, the camera uses the same technology to estimate the aperture as with M-lenses mounted via an adapter. This adapter is only compatible with the Leica SL camera. Leica single-lens reflex lenses manufactured before 1976 should not be mounted to the R-Adapter L, as this can cause damage to the mount.