Canon EF 17-40mm F/4L USM Lens

Description

Product Highlights: EF Mounted L-Series Lens Aperture Range is f/4-22 Three Spherical Elements, One Super UD Ultrasonic Autofocus Motor Manual Focus Override Water & Dust Resistant Inner Focusing and Zooming Truly spherical Diaphragm Front Filter Diameter is 77mm Rear Holder for 3 Gel Filters The EF 17-40mm f/4L USM Lens from Canon is a top quality ?L? series broad angle zoom lens for complete frame and APS-C size DSLR cameras. It joins one high-precision molded glass spherical element and 2 replica spherical lenses to attain the extensive zoom range, while correcting for regular aberrations that happen during zooming. Normally in wide-angle lenses, they face a problem of chromatic aberration of magnification but due to inclusion of super UD glass element this problem reduces in it. It also eliminates the color bleed around the edges of the subject and gives high contrast and high image resolution