The Sigma 50-100mm T2 Cine High-Speed Zoom Lens (Feet) with a Sony E-mount 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. What sets this lens apart from the standard Sigma High Speed Zooms is fully luminescent markings. When shooting in dim or dark environments, focus pullers and camera operators will be able to easily discern lens markings without resorting to distracting lamps or other disruptive light sources.
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 clickless 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).