sentences:  However, the current head of the optical department at Leica, Peter Karbe, interviewed during the photokina 2008 show, doesn't like this lens, which was discontinued in 2007.Mandler designed the Summilux-M 75 mm f/1.4 lens (1980) based on his previous design for the Summilux-M 50 mm f/1.4 lens (1961), but using new glass first applied to the Noctilux-M 50 mm f/1.0 lens (1969).In the same way, Karbe designed the APO-Summicron-M 75 mm f/2.0 ASPH lens (2005) based on his Summilux-M 50 mm f/1.4 ASPH lens (2004).