Brighter and lighter bright f12 aperture glass aspherical lens asp ultra multi coating umc technology of samyang optics circular aperture with 9 blades standard angle manual focus photo lens for mirrorless cameras samyang optics 50mm f12 as umc cs is a standard angle manual focus photo lens for mirrorless cameras with aps c sensor sizes with a significantly bright f12 aperture the lens creates bright and trust worthy images and impressive bokeh even with mirrorless cameras t