It features an extremely fast T0.95 to T16 aperture range, geared focus and aperture rings, and a clickless iris that allows smooth aperture pulls. The lens follows the industry-standard focus rotation, so when working with an optional follow focus unit there is no need to make an adjustment to how you work or add a reversing gear. The lens front does not rotate as you focus the lens; this allows you to use optional accessories such as clip-on matte boxes or the SLR Magic Anamotphot 1.33x - 50 anamorphic adapter. The Mark II features stronger mechanical components than the Mark I version of the lens, allowing you to use an optional SLR Magic Anamporphot 1.33x - 50 Adapter or an optional SLR Magic Achromatic diopter without requiring an optional lens support. Coverage The lens has a 35mm equivalent focal length of: 80mm on a Blackmagic Cinema Camera 100mm on a Blackmagic Pocket Cinema Camera 70mm on a standard Micro Four Thirds Sensor, although some vignetting may occur 52mm On Sony E or Fuji X mount cameras The clickless iris allows you to smoothly adjust your exposure during the shot. Built-in iris and focus gears follow industry standards, allowing you to work with optional follow focus units and lens gear motors. Focus rotation of the lens follows the cinema standard, allowing you to swap between this and other optional lenses without having to change your workflow.