The Schneider Xenon FF 25mm T2.1 Lens with 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. This lens is color-matched to a standard at the factory, minimizing color shift when changing lenses. It features a 14-blade iris, providing natural looking Bokeh, with circular out of focus highlights, and 300° of lens barrel rotation. The 25mm shares the same focus and iris gear position, as well as the same 100mm front barrel diameter with the other lenses in the Xenon FF line of lenses.