Product weight - 385g / Filter diameter (mm) - 77 / Max. diameter x length (mm) - 83.5 x 89.8 / AF actuator - USM / Lens construction (elements/groups) - 13/10 / Minimum aperture - 22-27 / Angle of view (horzntl, vertl, diagnl) - 97� 10' - 54� 30', 74� 10'- 37� 50', 107� 30' - 63� 30' / Maximum magnification (x) - 0.17 (at 22mm) / Magnification - Extension Tube EF12 II - 0.77-0.58 / Magnification - Extension Tube EF25 II - 1.51-1.28 / No. of diaphragm blades - 6 / Closest focusing distance (m) - 0.24 / Distance information - Yes / Image stabilizer - No / 35mm film equivalent focal length - 16-35