The Schneider Xenon FF 35mm T2.1 Lens in Canon EF mount is part of the Xenon FF set of lenses. FF stands for full frame, and every lens in the set covers a full frame image sensor without vignetting and is designed for 4K image capture. The Xenon FF lenses are color-matched to a standard at the factory, minimizing color shift when changing lenses. They feature a 14-blade iris, providing natural looking bokeh, with circular out of focus highlights, 300° of lens barrel rotation, and share lens gear positions and size.