The 135mm T1.5 AS UMC VDSLR II Lens for Canon EF Mount from Samyang is a manual focus prime lens. It provides a maximum aperture of T2.2 for effective low light capture and shallow depth of field control and a 9 blade iris for attractive bokeh. Optimized for cinema and video applications, the focus and aperture control rings are outfitted with industry standard gearing, which provides an interface for working with a traditional follow focus. The aperture control ring has also been de-clicked, which enables smooth iris pulls. In addition, bright aperture and distance markings are printed on the lens barrel facing laterally to facilitate easier control by a focus puller. The lens has a minimum focus distance of 2.6′. Internal focusing minimizes the effects of focus breathing, and the lens is composed of 11 elements in 7 groups. A lens multi-coating helps to improve light transmission reducing flare and ghosting. The filter thread diameter for attaching sunshades or filter rings is 77mm.