Average Reviews:
(More customer reviews)The auto focus is super quiet and reasonably fast in most situations, although mounted on my D30 it does get confused in complex lighting. This is a BIG and HEAVY lens. I use the neck strap provided with the lens, as well as the strap on the camera at the same time. Although I'm probably overcautious, I don't trust the weight of the lens hanging from the camera without extra support. Mounted on a monopod, it is well balanced although following birds in flight presents a challenge. Optically, it's truly beautiful through all f stops. It looks like it will take any abuse I can reasonably give it, being solidly constructed and manufactured to very precise tolerances. I wanted a quality super telephoto and I got one at a great price.
Click Here to see more reviews about: Sigma 50-500mm f/4-6.3 EX DG HSM APO RF Telephoto Zoom Lens for Canon SLR Cameras
The Sigma APO 50-500mm f4-6.3 EX DG HSM Lens for Canon Digital SLR Cameras is a high-magnification zoom lens with a 10x zoom ratio. The advanced optical design of the lens is optimized for digital SLR cameras, and the super coating on each glass surface produces superb color rendition, while reducing flare and ghosting. This lens uses four pieces of Special Low Dispersion (SLD) glass for excellent correction of color aberration throughout the entire zoom range. The Hyper Sonic Motor (HSM) provides quiet high-speed AF function, as well as full-time manual focus capability. This lens also features a Zoom Lock device to eliminate "zoom creep" when the lens is tilted down. When the lens is set to the 50 millimeter focal length, it is remarkably compact and provides easy handling. The tripod mount is composed of magnesium, to minimize total weight. It is also easy to grip and carry the lens due to ergonomic design of the tripod mount. Non-rotating front lens elements, due to the rear focus mechanism, make possible the use of a custom bayonet "petal-type hood," which prevents extraneous light from degrading the image quality. This mechanism also allows the use of circular polarizing filters, since the front barrel does not rotate during focusing or zooming.
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