Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens

Features:

• EF Mount Lens
• Aperture Range: f/4.5-40
• Diffractive Optical Elements
• Two-Mode Image Stabilization System
• Ultrasonic Autofocus Motor
• Manual Focus Override
• Zoom Ring Lock Lever
• Compact Form Factor
• Truly Circular Diaphragm
• Minimum Focus Distance: 4.6'

The EF 70-300mm f/4.5-5.6 DO IS USM Lens from Canon is a relatively compact telephoto zoom offering superior maximum-aperture performance across its entire focal length range. It incorporates Canon's DO (Diffractive Optics) and IS (Image Stabilizing) technologies.

The use of Diffraction Optics allows a lens to be shorter, lighter, and of higher image quality than comparable normal optical systems of the same focal length and aperture-while this lens is heavier than the consumer-grade EF 70-300mm f/4-5.6 IS USM lens, it is 28% shorter and uses Canon's very best ring-USM (ultrasonic) motor instead of the lighter, slower, and less costly 'micro-USM' motor.

The DO lens performs admirably at its maximum aperture, with images that are very comparable to the "L" series telephotos. It has a circular aperture diaphragm to help create natural out-of-focus highlights, and its built-in two-mode image stabilizer allows you to handhold the lens at shutter speeds 3 steps slower than would otherwise be possible. Mode 1 corrects vibrations in all directions and is best for still subjects whereas Mode 2 is best when following moving subjects either horizontally or vertically.

The lens' AF is super-fast and silent with a ring-type USM that focuses down to 4.6', and it enables manual focus override for precise manual focus even in AF mode. It also features a zoom lock button that keeps the lens safe and secure when not in use or when being used at the shortest 70mm focal length setting.  The EF 70-300mm f/4.5-5.6 DO IS USM is an ideal lens for sports, portraiture, animals, and other applications when you're shooting in relatively bright light.

• An autofocus telephoto zoom lens for both film and digital cameras

• Excellent maximum-aperture performance across entire zoom range

• Built-in two-mode image stabilizer action can be seen in the viewfinder and allows handheld images at shutter speeds 3 steps slower than without image stabilization

• Fast, silent autofocus with full-time manual focus override

• Diffractive Optics elements are combined to minimize aberrations, boost image quality and reduce the lens' overall length.

• With rear focusing, the lens does not change length or rotate during focusing.

• Compact form factor

• Circular aperture diaphragm for natural-looking out of focus highlights