Samsung SLA-550DV CS-mount Varifocal Lens Dubai Samsung SLA-550DV CS-mount Varifocal Lens Dubai The Samsung SLA-550DV CS-mount Varifocal Lens Dubai has a focal length of 5-50mm (F1.8). The Auto Iris feature in this SLA-550DV is creates reliable video signals and modifies the camera to changing light levels. Focus and zoom are by hand controlled.