Rokinon Cine CV10M-C 10mm T3.1 Cine Wide Angle Lens for Canon EF Cameras Nano Crystal Coating System (NCS) for increased light transmission and reduced internal reflections Fast T3.1 maximum aperture + close-focusing to 9.5 inches = maximum versatility in all shooting conditions Optimized for excellent optical quality and true ultra-wide 106 degree edge to edge coverage with Canon APS-C sensor digital cameras Utilizes 3 high precision (2 Aspherical + 1 ED) lens elements for superior image quality Inner focusing system (IF) - length doesn't change and front element does not rotate - keeps integrated petal-type lens hood properly oriented