Rokinon 10mm F2.8 ED AS NCS CS Ultra Wide Angle Lens for Fuji X Mount Digital Cameras (10M-FX). Nano Crystal Coating System (NCS) for increased light transmission and reduced internal reflections. Fast F2.8 maximum Aperture + close-focusing to 9.5 inches = maximum versatility in all shooting conditions. Optimized for excellent optical quality and true ultra-wide 110 degree edge to edge coverage with 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.