The XF8-16mmF2.8 R LM WR is a fast ultra-wide angle zoom lens that has a constant maximum aperture of F2.8 and is equivalent to 12-24mm in the 35mm format.
The XF23mmF2 R WR is a wide-angle lens with advanced image resolution, capable of drawing out the full performance of Fujifilm's proprietary X-Trans CMOS sensor.