Product weight - 475g / Filter diameter (mm) - 67 / Maximum diameter x length (mm) - 78.5 x 92 / AF actuator - USM / Lens construction (elements/groups) - 17/12 / Minimum aperture - 22-32 / Angle of view (horzntl, vertl, diagnl) - 68� 40' - 15� 25', 48� - 10� 25', 78� 30' - 18� 25' / Maximum magnification (x) - 0.20 (at 85mm) / Magnification - Extension Tube EF12 II - 0.43 - 0.14 / Magnification - Extension Tube EF25 II - 0.72 - 0.33 / No. of diaphragm blades - 6 / Closest focusing distance (m) - 0.35