This new member in the Mitakon Speedmaster family is a ultra-fast prime lens which provides a 35mm-equivalent focal length of 50mm in the Micro Four Thirds system. A maximum aperture of f/0.95 makes it extremely convenient to shoot at a low light conditions without flash and . Most importantly, this lens weigh merely 0.51 pounds and 1.8 inches long. The compact size and fast aperture make it an ideal companion of your camera for everyday shooting in a wide variety of conditions. Despite the extreme light weight, the lens incorporates a 11 elements in 9 groups optical design, including 1pc of Extra-low dispersion elements, 4 pcs of Extra-high Refractive Index elements and 2pcs of High Refractive index elements. This structure effectively controls the chromatic aberration and deliver excellent image sharpness even at f/0.95. The lens also features a 11 pieces of aperture blades to form a close-to-circle aperture for a creamy depth of field. Optimized lens coatings also help to suppress lens flare and ghosting. Manual focus design and a click-less, silent aperture ring promote smooth handling and are especially well-suited to video applications. The lens is built in metallic enclosure with additional protective process and finest finishing, which gives extra durability and aesthetic. EM5 (II) is fine to use. The reason is due to the ladder-like internal structure around the sensor of some Micro Four Thirds cameras.