Iris Pull? This spud takes seconds to put on a moviecam body. There is a small dovetail on the face of the camera, next to the lens. This simply slides onto that dovetail and a finger knob secures it. This can be used as a primary focus motor spud or a quick addition in the case of an Iris pull. Will work with both Compact and SL Bodies. The stud is (15mm) 2 ½” long and is Anodized Gray.