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 a built-in gear for video systems with follow focus. Samyang 10mm lenses are ultra wide-angle manual focus prime lenses designed for APS-C cameras with CS/cropped sensors, offering excellent optical quality and exceptional resolution, providing an exceptionally wide field of view of up to 109.5 degrees of rectilinear image. Samyang 10mm lenses are the first Samyang lenses to use a brand new Nano Crystal (NCS) anti-reflection coating system. 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 to the surface of the lens. Further benefits offered by the nanocrystalline layer include improved light transmission and increased resistance to flare, resulting in maximum image contrast. Combined 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 category. The optical construction includes 14 elements arranged in 10 groups, including 2 AS aspherical lenses and one extra-low dispersion glass element. The Samyang 10mm VDSLR is equipped with a built-in fixed lens hood. Although VDSLR versions were primarily developed for professional cinematographic/cinema production, they can also be used for still photography. Samyang's VDSLR versions are rated in T-Stops rather than F-stops, which is customary for cinema camera lenses. The F-stop number expresses the speed of the lens assuming 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