Canon EF 17 - 40 mm f/4L USM Lens (Black)

General Brand Canon Name Ultra Wide Angle Model EF 17 - 40 mm f/4L USM Color Black Type Zoom Prime/Zoom Zoom Lens Type Wide-angle Filter Attachment Size 77 mm Minimum Aperture 22 Compatibility Features Suitable For Art Lens Mount EF Lens Features Lens Construction (Elements/Groups) 12 Elements in 9 Groups Angle of View Diagonal: 104 - 57 30 ?, Horizontal: 93 - 49 20 ?, Vertical: 70 30 ? 34 Focus Type Auto Drive System Ring-type USM Performance Features Maximum Focal Length 40 mm Minimum Focal Length 17 mm Aperture with Max Focal Length f/4 Aperture with Min Focal Length f/22 Minimum Focusing Distance 0.28 m Maximum Magnification (x) 0.24 Additional Features Other Specifications Water or Dust-resistance, Distance Scale, Superb Optical Performance, Fast Autofocus Speed, Ultrasonic Focusing, Non-rotating Front Element, Magnification - Extension Tube EF12 II: 0.83 - 0.32, Magnification - Extension Tube EF25 II: 1.02 0.70