Sigma’s 40mm T1.5 FF High-Speed Prime Lens combines the same high-quality optics and mechanics of their Global Vision still line in a cine-oriented design. This 40mm Canon EF-mount prime is a mid-range focal length in the series, offering full-frame sensor coverage, 6-8K resolution, and a T1.5 aperture in a compact, lightweight form. A common 95mm front diameter and similar physical attributes across the lens line make it easier and quicker to mount lens accessories such as matte boxes, follow focuses, and lens control motors.