BProfessional DSLR RIG Shoulder Mount Follow Focus Whips, Crank, Matte Box Support System Kit Rig DSLR by ePhotoInc RLO3 ReviewbP PP Professional DSLR RIG Shoulder Mount Follow Focus Whips, Crank, Matte Box Support System Kit Rig DSLR by ePhotoInc RLO3 PUltimate video camera device for movie lovers with video digital SLRsPPrecision engineered design with Swing-Away MatteBoxP2 filter trays, supporting both 4x4 and 4x5.6" filterPFollow Focus is Completely gear driven designPRail System With height adjustment.