The XF14mm f 2.8 R, an ultra-wide lens equivalent to 21mm on full frame (35mm) cameras. The build quality of the lens is very good with a metal body and mount. The XF14mm f 2.8 R is a highly attractive ultra-wide lens with few shortcomings. The most important factor for an ultra-wide lens is certainly image sharpness and it certainly delivers in that respect. It is sharp in the image center and very good in the outer image region. Distortion is non existent, which is surprising for such a wide lens providing a 90 degree field of view.