Mounted on a Nikon D800: dérawtisé files under DXO Optics Pro 9 (torque Apn / Obj recognized) are superb! I got the latest version for Nikon (red gold ring and not as pictured). The distance information Map of the ring are consistent, using the viewfinder (dot surrounded by two arrows) works well, the Exif are filled and adjusted diaph on the case. That's perfect. Very high quality manufacturing without backlash. The dedicated filter holders purchased in addition is a little cheap and very hard to put in place but not expensive either ...