Sigma 18-35mm Cine Zoom 

The Sigma 18-35mm T2 Cine High-Speed Zoom Lens with a Canon EF mount
and 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. What sets these lenses 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,
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.