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 wrote about Mandler after his death: "I can assert with certainty that Dr. Mandler was a major optical designer at Leitz and made significant contributions to the success of the Leica M camera. Dr. Mandler's forward-thinking approach is demonstrated by his numerous innovative calculations, which remain relevant.