6K Ready Optics Full Frame Coverage Tightly Color Matched Durable All Metal Body Unified 40 Degree Iris Rotation Unified 40 Degree Iris Rotation Large Easy To Read Markings Three Year Limited Warranty Xeen Proprietary X-Coating Technology Unified 114mm Non-Rotating Front Diameters 11 Bladed Diaphragm for Superb Bokeh Dual Calibrated Right and Left Side Distance and T-Stop Scales Unified Focus and Aperture Gear Positions for Easy Follow Focus Use Mounts can be shimmed and are interchangeable by a qualified technician Incredibly smooth and fully damped movement of focusing and aperture controls