A zoomable magnifier is a clever solution to a perennial problem: the Leica M's non-TTL fixed OVF lacks both native diopter correction, and automatic tracking to a lens’s native FOV. After being asked by dozens of readers to check out MGR's zoomable Bresson finder-- reported by Leica Rumors in August of 2015 -- MGR sent me one for review. Many thanks, MGR.