Samyang's 14mm T3.1 ED AS IF UMC II Video is a wide angle, manual focus cine lens with Micro Four Thirds fit designed for use on Compact System Cameras. It has been carefully designed for professional film and video work, with the focus gear ring allowing the use of follow focus systems. The decoupled aperture changes quietly and 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 and precise control. A detachable petal-shaped lens hood is provided.This product comes with a 1 year limited warranty.