The B4 mount 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 f/2.8 maximum aperture range and an M82 x 0.75 filter thread. This lens is available exclusively as part of a Blackmagic URSA Broadcast camera kit.