Another happy BEOON user here. For 35mm scans, I use a Leica CL with M-Adapter L on a BEOON with extension rings B and D and a Leitz Focotar-2 4.5/50mm enlarger lens. This combination delivers the correct 1:1.5 magnification required to scan 35mm negatives with a CL. The Focotar-2 lens works perfectly at this magnification.