This Fine Lumi-Micron screen provides a very bright finder image. Suitable for general photography and ideal for photographers who prefer a clear-cut view field free from microprism or split prism and for those who are accustomed to focus using matte area. Also suitable for super telephotography as well as close-up photography in conjunction with macro lenses and Auto Bellows. Focusing is done on the matte area. This screen can't be used in an OM-1(N) or OM-2(N).