The Canon CN-E 135mm T2.2 L F Cinema Prime Lens is a telephoto prime lens for the full-frame sensor format, which makes it an ideal lens for the Cinema EOS series and all Canon DSLRs. The maximum aperture is T2.2, and the 11 blade iris ensures beautiful, rounded bokeh. The lens features markings on both sides of the barrel, making it easy to read settings from behind or on either side of the camera. In order to make lens changes quicker and easier, the 135mm T2.2 is designed to share similar dimensions with other CN-E lenses.