The XF8-16mmF2.8 R LM WR features an optical construction of 20 elements in 13 groups, including 4 aspherical lens elements to control distortion and spherical aberration, and 6 ED lens elements including 3 super ED elements to control lateral chromatic aberration, a lens design that produces advanced image-resolving performances across the entire zoom range. Featuring a floating lens element that adjusts according to the position of the zoom, the XF8-16mmF2.8 R LM WR achieves edge-to-edge sharpness, and corrects field curvature that is typically found in ultra-wide angle lenses. The lens barrel is lightweight yet robust, sealed at 11 points, designed to be weather and dust-resistant and capable of operating in temperatures as low as 14°F/-10°C.