This cinema 16-28mm T3.0 Lens is a 4K-ready ultra-wide zoom that covers not only Super 35/APS-C sized sensors, but full-frame sensors. It features a super wide angle at 16mm and traditional wide angle at 28mm. It's parfocal so it stays in focus when the focal length is changed. This very sharp lens has standard 0.8 pitch geared rings for smooth and precise control of focus, zoom, and iris. It is relatively fast, with a constant T/3.0 maximum aperture, and has very good handling on distortion and falloff. It features a common 114mm front diameter for use with a wide variety of matte boxes and accessories. The housing is robust but even so the lens is relatively lightweight. You can refer to the ePhotoZine review for more information.