Product weight - 310g / Filter diameter (mm) - 58 / Maximum diameter x length (mm) - 73.6 x 55.6 / AF Actuator - USM / Lens construction (elements /groups) - 10/9 / Minimum aperture -22 / Angle of view (horzntl, vertl, diagnl) - 65�, 46�, 75� / Maximum magnification (x) - 0.18 / Magnification - Extension Tube EF12 II - 0.61 - 0.43 / Magnification - Extension Tube EF25 II - 1.13 - 0.96 / No. of diaphragm blades - 7 / Closest focusing distance - 0.25