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The Canon EF 100-300mm f/4.5-5.6 USM is a highly practical and portable Telephoto Zoom lens. With rear focusing, the Canon EF 100-300 lens does not change length or rotate during focusing.The Canon EF 100-300mm f/4.5-5.6 USM lens has five zoom groups that make the length only 121.5mm. With rear focusing, the Canon EF 100-300 lens makes auto focusing quick and quiet. The Canon EF 100-300mm f/4.5-5.6 USM lens completes a fusion of state-of-the-art electronics, mechanical precision, and optical excellence. The fully electronic EF lens mount is unique among 35mm SLR cameras, operating silently and reliably due to the complete elimination of mechanical couplings. The Canon EF 100-300 has a custom - designed auto focus motor and microprocessor, and employs ultrasonic motor technology, aspherical lens elements, fluorite crystal and ultra low-dispersion glass. The Canon EF 100-300 is designed for use with all EOS cameras, allows auto and manual focus modes, rear focusing system, and has an affordable price. The minimal focus distance is 1.5m resulting in a max. object magnification of 1:4 at 300mm. The optical design is made of 13 elements in 10 groups with no special elements. The Canon EF 100-300mm f/4.5-5.6 USM lens features 8 aperture blades. With a size of 73x122mm and weight of 540g it remains quite compact qualifying it as a good walk-around tele zoom lens. The Canon EF 100-300 telephoto zoom lenses allow you to capture details normally missed by the eye. Capture the far off action of fast-paced sports or zoom in for an intimate portrait with a blurred background. In addition, the unique feature of these Canon EF 100-300 lenses to compress images allows you to create a variety of impressive images. see the Canon EF 100-300mm f/4.5-5.6 USM and full range here