This filter can be attached to lenses with a 58mm filter thread, such as the Hector 125mm F2.5, Summarex 85mm F1.5, and Noctilux 50mm F1 E58 (early model). It is a combination of a German-made silver-rimmed Uva filter and a New York Leica black-rimmed (orange filter) with a Kenko Skylight filter.