Filter Size Accepts Gel Filters In Rear Slot F-Stop Range 2.8-22 Minimum Focus Distance .8' Magnification Zoom/Focus Control Angle Of View 114 Deg. Groups/Elements 10/14 Lenght 3-1/2' Max. Diameter 3-5/16' Weight 19.6 Oz. Specialties Internal Focusing, Aspherical Lens, Floating Elements