The Canon EF 24-85mm f/3.5-4.5 USM lens has multiple moving lens groups that enhance image quality and make the whole system more compact and lightweight. This lens uses an ultrasonic focusing motor (USM) that gives you silent, high-speed autofocusing. Canon eliminated all the mechanical couplings in this lens and added a custom-designed autofocus motor as well as a microprocessor. Built into the system is a replica aspherical lens element that minimizes optical distortions to give you sharp images. The flare-cutting diaphragm helps the lens produce a high-contrast image, even in tough lighting. Its high zoom ratio of 3.5x allows you to take tighter shots of your subjects. It's fully compatible with all EOS cameras.