Peter Karbe wrote some lines about Mandler after his death: "I can readily say that Dr. Mandler was one of the great optical designers at Leitz and that his work constituted a major contribution to the success of the Leica M rangefinder camera. Dr. Mandler was clearly ahead of his times with his developments. That is proven by the numerous optical computations that still have lost nothing in terms of current relevance.
Peter Karbe composed some passages about Mandler following his passing: "It's clear to me that Dr. Mandler was a leading figure in optical design at Leitz, and his work played a crucial role in the success of the Leica M camera. Dr. Mandler's pioneering spirit is evident in his groundbreaking developments, which continue to be relevant today.