F1.4 aperture creates fantastic image with shallow depth and smooth focus gear ring allows precise adjustment Extra low dispersion lens reduces chromatic aberration effectively to produce excellent image quality UMC technology reduces flare and ghosting as much as possible for clearer brighter images 9 aperture blades create almost a full circle when closed 0.28m minimum focusing distance captures subjects at close range Samyang's 21mm F1.4 ED AS UMC CS is a wide angle manual focus photo lens for mirrorless cameras with APS-C sensor sizes. With broad 21mm angle of view and 3 glass aspherical lenses, it provides an opportunity to experience the depth and breadth of photography. The Samyang 21mm F1.4 can be used for various purposes, such as exterior and interior landscapes and portraits. Samyang's 21mm F1.4 ED AS UMC CS has a low F number (F1.4). allowing you to precisely control the lens when shooting under various exposure environments including relatively dark situations. This lens features 8 elements in 7 groups including 1 extra low dispersion lens (ED) and 3 glass aspherical lenses (ASP) to offer high resolution throughout the image. Samyang's Ultra Multi Coating (UMC) is used to optimise the light penetration and minimises flare and ghosting. 0.28m minimum focusing distance helps to capture the object in close proximity. The lens features 9 aperture blades which are designed to be almost a full circle when the aperture is closed. This produces starlike rays clearly and beautifully. The solid frame of the lens is constructed from high-strength aluminium alloy which allows the lens to be lightweight, yet strong. A detachable petal-shaped lens hood further minimises flare and ghosting by sheltering the lens from unwanted stray light. Available for 4 mirrorless camera mounts: Sony E, Micro 4/3, Fuji-X and Canon M.