
Canon EF 70-300mm f/4.5-5.6 DO IS USM is a telephoto zoom. The aim has 70-300mm in length with maximum aperture of F/4.5-5.6. Focusing: Rear focusing system with focusing cam to the point close to 1.4 m / 4.6 feet and has a filter size of 58mm. The Canon EF 70-300mm f/4.5-5.6 DO IS USM weighs 25.4 ounces and measuring 3.2 inches in diameter and 4 cm long.
“Bokeh is good.” This objective measures good for the blur. F/5.6 is the best opening when the lens is at its widest focal length and f/16 is the strongest opening to 300mm. ”
Canon raises the stakes for professional photography with its EF 70-300mm f/4.5-5.6 DO IS USM telephoto lens with image stabilization. A virtually silent ultra-sonic motor (USM) gives the lens extremely fast autofocus. The lens also includes Canon’s Image Stabilization technology to dramatically reduce camera shake, compensating for approximately three stops in shutter speed without any perceptible increase in image blur.
DO Elements
Use of the new three-layer DO lens drastically reduces the overall length and weight of the lens system increasing the refractive power of each lens element and reducing the spaces between elements. It’s approximately 26 percent shorter and 36 percent lighter than any lens of comparable specifications.

Zoom lock
The EF 70-300mm lens features a zoom ring locking mechanism, locking the lens at its shortest total length. This helps to protect the lens from potential damage by preventing the zoom elements extending under their own weight, which might otherwise occur when the lens is mounted to a camera that hangs from a neck or shoulder strap.
Image Stabilization
The lens incorporates Canon’s Image Stabilization (IS) technology, compensating for approximately three stops without any perceptible increase in image blur when shooting static subjects or panning.

Fast AF
A rear focusing ring type USM, high-speed CPU and new AF algorithms combine to give the lens extremely fast auto-focusing. The lens has a minimum focusing distance of just 1.4m throughout the entire zoom range.