The Samyang 10mm T3.1 ED AS NCS CS VDSLR lens is the cine/video version of the Samyang 10mm T3.1 ED AS NCS CS lens, offering the same excellent optics, but with an integrated gear for follow focus systems on video equipment. The Samyang 10mm lenses are manual focus ultra wide-angle prime lenses designed for CS/APS-C cropped sensor cameras, offering excellent optical quality and exceptional resolution, providing an exceptionally wide field of view of up to 109.5 degrees of rectilinear image. The Samyang 10mm lenses are the first Samyang lenses to feature a brand new Nano Crystal System (NCS) anti-reflection coating. This new coating offers an even lower reflection factor than Samyang's UMC coatings. NCS coating technology provides a precise process for applying the anti-reflection coating more uniformly across the lens surface. The additional benefits provided by the nanocrystalline layer include improved light transmission, increased resistance to flare, resulting in maximum image contrast. Paired with a T3.1 aperture, considered fast for a wide-angle lens, it offers good low-light capability. Like all Samyang lenses, the 10mm is very well built for a lens in its class. The optical construction consists of 14 elements arranged in 10 groups, including 2 AS aspherical lenses and one extra-low dispersion glass element. The Samyang 10mm VDSLR features an integrated fixed lens hood. Although the VDSLR versions were primarily developed for professional cinema/filmmaking purposes, they can also be used for photography. Samyang's VDSLR versions are rated in T-Stops rather than F-stops, which is the standard for cinema camera lenses. The F-stop number expresses the speed of the lens assuming that the lens transmits 100% of the incident light. The T number expresses the actual light transmission, which is more accurate, and is the standard for professional cinema lenses. Available in 10 camera mounts: Canon EF, Canon-M, Nikon F, Pentax K, Sony A, Sony-E, Four-Thirds, MFT, Samsung NX and Fujifilm X. Specifications