EF 17-40mm f/4L USM
Focal Length & Maximum Aperture - 17 - 40mm; 1:4
Lens Construction - 12 elements in 9 groups
Diagonal Angle of View - 104° - 57° 30'
Focus Adjustment - Inner focusing system with USM
Closest Focusing Distance - 0.28m / 0.9 ft.
Zoom System - Rotating type
Filter Size - 77mm
Max. Diameter x Length, Weight - 3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g
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