Rokinon's Xeen 50mm T1.5 Lens for Canon EF Mount is built specifically for use as a cinema lens, and is not a modified still lens. It features an internal focus design so that the lens does not change size while focusing, minimizing breathing. Each lens in the Rokinon Xeen cinema lens set is multi-coated for good contrast, glare prevention, and are color matched to a factory standard, allowing you to assemble a set over time with minimal color shift. This 50mm lens provides what is considered a normal angle of view on full-frame cameras, and a tighter angle of view on smaller formats. The lens features dual sided focus scales in feet, with dual sided iris scales. The 11-bladed iris provides a rounded aperture for a natural looking highlights and Bokeh.