The Sigma 18-35mm T2 Cine High-Speed Zoom Lens with focus scales marked in feet provides an image circle that covers Super 35mm-sized sensors. It features a maximum T-stop of 2, and the aperture does not ramp over the zoom range. It shares common lens gear positions with the other lens in the Sigma High Speed Zoom lineup, which makes for rapid lens changes. The 9-bladed iris provides round out-of-focus highlights for a natural-looking bokeh. The lens barrel features 180° of rotation from close focus to infinity, and the zoom barrel rotates 160°, and the click less iris ring features 60° of rotation. All three lens control rings are geared with cine-standard 0. 8 Mod gears, and the focus scale is marked in feet. The front of the lens is 95mm in diameter with a removable 1/4"-20 support foot that helps support the lens with the aid of a 1/4"-20 rod-mounted lens support (not included).