CANON EF 17-40mm f/4L USM Lens

The EF 17-40mm f/4L USM Lens from Canon is a high quality "L" series wide angle zoom lens for full frame and APS-C size DSLR cameras. It combines one high-precision molded glass aspherical element and two replica aspherical lenses to achieve the extended zoom range, while also correcting for common aberrations that arise during zooming. A Super UD (Ultra-low Dispersion) glass element minimizes the chromatic aberration of magnification which tends to occur with wide-angle lenses, to help eliminate color bleed along the edges of the subject and achieve high image contrast and resolution.

 

• EF Mount L-Series Lens
• Aperture Range: f/4-22
• Three Aspherical Elements, One Super UD
• Ultrasonic Autofocus Motor
• Manual Focus Override
• Water and Dust Resistant
• Internal Zooming and Focusing
• Truly Circular Diaphragm
• 77mm Front Filter Diameter
• Rear Holder for Three Gel Filters