Utilizing a multi-layer coating process for consistent color rendition from lens to lens the Rokinon 20mm T1.9 Cine DS Lens answers the challenge of assembling a set of lenses over time. The lens has a Canon EF mount and features industry standard geared focus and iris rings that share common position with other Rokinon Cine DS lenses. To aid focus pullers who have to work both sides of the lens, the aperture and focus scales are marked on both sides of the lens.