High performance, water-resistant ultra wide-angle L-series lens featuring improved edge-to-edge image quality.Focal Length & Maximum Aperture: 16-35mm f/2.8 Lens Construction: 16 elements in 12 groups Diagonal Angle of View: 08°10'-63° Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.92 ft./0.28m Filter Size: 82mm, P=0.75mm/1 filter Max. Diameter x Length, Weight: 3.5 in. x 4.4 in./88.5mm x 111.6mm, 640g