The Samyang 20mm F1.8 ED AS UMC is a wide angle manual focus lenses for DSLR cameras with full frame sensor size. The bright F1.8 aperture secures a fast shutter speed even under the restricted lighting conditions to offer best quality images. In between ultra-wide 16mm & wide-standard 24mm, a 20mm lens is a perfect fit to explore wide angles not only for shooting indoor images such as concerts & interior photos but also street snaps. The 0.2m of minimum focusing adds versatility to the lens. Ultra Multi Coating & two aspherical lenses along with three extra-low dispersion have been included in the optical design, that also features 13 elements in 12 groups to minimise aberration & unnecessary light dispersion, delivering high resolution from the centre to the corners of the image