Canon developed the world’s first lens-based Ultrasonic Motor (USM) to power the lens autofocus mechanism. Instead of large, noisy drive trains powered by conventional motors, Canon USM lenses employ the minute electronic vibrations. The focusing action of the lens is fast and quiet, with virtually instantaneous stops and starts. USM lenses also draw minimal power from the camera, helping to ensure longer battery life.
Reduce Ghosting And Chromatic Aberration
Reducing color fringing, or chromatic aberration has been one of the great challenges in the design of telephoto lenses. Canon lenses employ Canon’s Ultra-low Dispersion glass to help minimize this effect, providing much-improved contrast and sharpness.
Keep Your Lens Clean
This canon lens is specially treated with Fluorine coating that helps you effectively repel dust, water droplets, grease or dirt, ensuring easy removal even when they adhere to the lens surface.