The Leitz SYEOO Sports Viewfinder, in very good-just very light signs of use - clean glass, is a foldable optical accessory designed by Ernst Leitz Wetzlar in the mid-1930s, specifically for Leica screw-mount cameras equipped with 13.5cm (135mm) lenses. Introduced around 1935, it was part of a series of sports finders that included models like SAIOO, SEROO, and SIZOO, each tailored for different focal lengths. The SYEOO model was crafted to provide photographers with a clear and accurate framing solution for telephoto compositions, especially in dynamic shooting environments
