Fujinon 2/3” Mount LA16x8BRM-XB1A Lens The LA16X8BRM-XB1A 2/3″ 4K Lens from Fujinon is an 8-128mm zoom lens designed for the Blackmagic URSA Broadcast camera. This dedicated lens features electronic back focus adjustment and a macro function at its front. The included focus/zoom servo unit suits this 4K lens for ENG or studio use. Additional features include an f/1.9 to 2.8 maximum aperture range and an M82 x 0.75 filter thread.