The 50-150mm f/2.8 EX DC OS HSM APO Lens for Canon Cameras from Sigma is a fast f/2.8 telephoto zoom lens with a 50-150mm focal length (75-225mm equivalent in 35mm format) designed for cameras with a Canon EF mount. This long autofocus telephoto gets you close to the action, and it has an optical image stabilization system that makes it possible to hand-hold the lens at up to four shutter speeds slower than usual, while maintainingsharp, shake-free images. The Hyper Sonic Motor (HSM) gives you quiet, high-speed autofocus, and also allows full-time manual focus override.

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