The Tokina Cinema ATX 11-20mm T2.9 Wide-Angle Zoom Lens (PL Mount) features a super-wide field of view and cine-style design elements. It covers Super 35mm image sensors and is a parfocal lens, holding focus throughout zoom moves. The Cinema ATX 11-20mm maintains a constant T2.9 aperture throughout its zoom range, eliminating the need for exposure compensation as you zoom in. Its durable metal housing withstands the rigors of cine production and incorporates 0.8 Mod lens gears for compatibility with FIZ (focus/iris/zoom) control systems.