Samyang's 14mm T3.1 ED AS IF UMC II VDSLR is a wide-angle, manual focus cine lens designed for use on DSLR cameras with full-frame & smaller sensors. It has been carefully designed for professional film & video work, with the focus gear ring allowing the use of follow focus systems. The decoupled aperture changes quietly & smoothly via another gear ring. The T number of 3.1 refers to the actual light transmission, while distance scales are marked on both sides of the lens to allow easy & precise control. A petal-shaped lens hood is provided.