Leica E41 Skylight Filter. This is a 41mm screw-in filter, suitable for use with lenses such as the Summarit 50mm/F1.5 and the Summilux 35mm/F1.4 (1st) Steel Rim. Genuine E41 filters are rare to begin with, but the E.Leitz N.Y. marked ones are even rarer. Summarit marked and Wetzlar Germany marked ones are occasionally seen, but E.Leitz N.Y. marked ones are hardly ever seen. It has some signs of use, and there is some slight corrosion on the edge of the glass, but overall it is very clean. There are no defects that would interfere with use. #Leica #Summarit #Summilux