The Samyang 16mm T2.2 ED AS UMC CS VDSLR Lens is a fast,is a ultra  wide-angle manual focus lens designed for CS / cropped sensors APS-C /  DX and MFT cameras and camcorders. Available mounts for Canon EF, Nikon  F, Sony A, Sony E, Canon M (EF-EOS M), Fuji / Fujifilm X and Olympus /  Panasonic Micro Four Thirds (MFT / M43) fittings
This VDSLR  (Video DSLR) version has been developed primarily for professional cine /  movie making purposes. The VDSLR version feature follow focus gearing  and decoupled aperture, which allow the user to smoothly and quietly  change focus and aperture / depth of field whist filming, and link to  professional follow focus cam systems.
The Samyang is rated in  T-Stops rather than F-stops which is usual for movie camera lenses.  F-stop number expresses the speed of the lens on the assumption that  lens transmits 100% of the incident light. The T-number expresses the  actual light transmission, which is more accurate, and is the standard  in professional cine lenses.
The Samyang 16mm T2.2 ED AS UMC CS VDSLR lens version is optically the same as the standard  Samyang 16mm f/2.0 ED AS UMC CS version 
 
The Samyang 16mm is a rectilinear lens, offering superb image  quality and low distortion. It is perfectly suited to cropped sensor  cameras for landscape and general photography requiring a high quality  wide angle lens. The large f2 aperture allows for low light photography.  
Optical construction is 13 elements in 11 groups, with 2  aspherical lenses, 1 Extra-low Dispersion (ED) element and one hybrid  aspherical and feature Samyang's UMC Ultra Multi coating coating which  ensures superb transmission of light, and minimises flare and ghosting.  The elements are housed in a solid body weighing from approx 570g,  dependant on mount.
Suitable for both for professional and  amateur photographers the 16mm is equivalent to 24mm equivalent on APS-C  sized sensors,  25.6mm on Canon EOS (1.6x crop factor), and 32mm on  Olympus and Panasonic MFT sensor system cameras.
The new Samyang  16mm lens accepts 77mm filters to attach ND, polarisers or any filter  with a 77mm filter thread, and features a detachable petal lens hood.
The  Samyang 16mm features a wide, ribbed manual focus ring which is smooth  and well-damped. This provides a positive manual focus, particularly  suitable for more professional videoing / filming with DSLR’s where  manual focus is preferred, enabling focussing pulling whilst video  recording.
The lens is supplied with front and rear lens caps, petal shaped lens hood, and soft lens case.
Available  fittings: Canon EF Canon M mount (EF-EOS M), Nikon F, Sony A, Sony E,  Fujifilm X, Pentax K, and Olympus / Panasonic Micro Four Thirds (MFT /  M43) mount versions