The Samyang 24mm f 1.4 ED AS IF UMC is a wide-angle lens perfect for landscape, travel & documentary photography. This manual focus lens is constructed of 13 lenses (including 4 ED glass elements) arranged in 12 groups, with multi-layered & anti-reflective UMC coatings to help prevent ghosting & flare & to ensure a high-contrast image. Thanks to its fast f 1.4 maximum aperture, the Samyang 24mm is a good low light performer & a great all-round lens for travel photography. UMC stands for Ultra Multi Coated, which indicates that the lens has been covered with multi-layered, anti-reflective coating which minimises reflections & increases image contrast. Suitable for Sony's full-frame (EG. a 7 II, a 7R II & a 7S) & cropped sensor E-mount cameras.