Product weight - 575g / Filter diameter (mm) - 72 / Max. diameter x length (mm) - 81.6 x 87.5 / AF actuator - Ring USM / Lens construction (elements/groups) - 17/12 / Minimum aperture - 22-38(36)_ / Angle of view (horzntl, vertl, diagnl) - 74� 10' - 15� 25', 53� 30'- 10� 25', 84� 30' - 18� 25' / Maximum magnification (x) - 0.21 (at 85mm) / Magnification - Extension Tube EF12 II - 0.44 - 0.155_ / Magnification - Extension Tube EF25 II - Not Recommended / No. of diaphragm blades - 7 / Closest focusing distance (m) - 0,35 / Distance information - Provided / Image stabilizer - 4-stops / 35mm film equivalent focal length - 24-136