The XF8-16mm F2.8 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 Ed elements to control lateral chromatic aberration, a lens design that produces advanced image-resolving performances across the entire zoom range. Featuring a field curvature correction element that adjusts according to the position of the zoom, the XF8-16mm F2.8 R Lm Wr achieves edge-to-edge sharpness, correcting field curvature that is typically found with 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 14F/-10C..