Yes, they're just great. I have one with scale focusing, and I have a Novoflex without focusing. They are very useful if you want to use your cherished Nikon F lenses on the R-D1s (or any M camera for that matter). No problem using using a wide angle lens, but focussing on a tele lens can be tricky. I use every now and then a 35-105 AIs zoom, and also a 70-210 tele zoom. Just fine. But the long lenses are best used on infinity, because focusing beyond 50mmon on the Epson rangefinder is really tricky...