Lens details
Maximum Diameter x Length (mm) 80.4 x 105.5
Filter Diameter (mm) 72
Angle of View 54°, 38°, 63°
Magnification with Extension Tube EF25 II 0.74-0.41
Magnification with Extension Tube EF12 II 0.63-0.18
Minimum Aperture 22
Maximum Aperture f/1.4
Lens Construction (elements/groups) 14/11
Distance Information Yes
Magnification  0.21 
Closest Focussing Distance (M) 0.28
Weight 760 g
AF Actuator  Ring USM
No. of Diaphragm Blades 9