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Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens
Angle of view (Horizontal, Vertical, Diagonal): 84 to 34 degrees, 53 to 19 degrees, 74 to 29 degrees
Lens construction: 12 elements in 9 groups
Number of diaphragm blades: 7
Minimum aperture: 22
Closest focusing distance: 0.92 feet
Maximum magnification: 0.24x (at 40mm)
AF actuator: Ring USM
Filter diameter: 77 millimeters
Maximum diameter by length: 83.5 by 96.8 inches
Weight: 17.6 pounds
Magnification with Extension Tube EF 12 II: 0.83 to 0.32
Magnification with Extension Tube EF 25 II: 1.02 to 0.40
Lens hood: EW-83E
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