The Samyang 14mm T3.1 Cine Lens for Canon EF-Mount is optimized for film and video applications. The focus and iris rings feature industry-standard gearing which provides an interface for use with a follow focus. To aid focus pullers aperture and focus scales are marked on the side of the lens. This 14mm lens produces a 115.7° ultra-wide angle-of-view when used with a full-frame or 35mm camera. Hybrid aspherical lenses render sharply defined images with a minimum of distortion and chromatic aberrations and the minimum focus distance is 11.02 inch from the lens.Some cameras will require that Shutter Lock be disengaged when using this lens.14mm lens with approximately 115.7° angle-of-view on full-frame cameras Industry-standard gearing for focus and aperture rings inch Declicked inch aperture ring for smooth iris pulls 14 elements in 10 groups with 3 high refractive index elements 2 ED element an aspherical hybrid element and a aspherical glass element Ultra Multi Coated lenses minimize flare and ghosting A minimum focusing distance of 11.02 inch A built-in petal-type lens hood .