Average Reviews:
(More customer reviews)This is an awesome lens and is a real must-have for birdwatching and other nature photography. The zoom range is extremely flexible and the f-stop reasonably fast, but keep in mind that this is a very, very specialized lens. First of all, yes, it is gigantic! This is not something you'll be carrying around day-to-day. It can be very challenging to get sharp pictures at focal lengths beyond 400mm or so. You MUST MUST MUST use a sturdy, high-end tripod and gimbal head. This will also preclude the "downward fall" described in another review. The lens alone is very heavy, and once you toss in a sturdy tripod you're talking 25+ pounds of equipment at a minimum; this is really going to limit your mobility and affect the way you shoot. It takes a lot of forethought to use this lens, but I prefer to think of that as an advantage.
When used properly, this lens has fantastic image quality -- very sharp, excellent contrast. When I say sharp, I am talking L-series sharp, even wide open. The HSM focus speed is fast, perhaps slightly slower than Canon's USM but not appreciably so. The only thing it's really missing is image stabilization (or optical stabilization, as Sigma calls it), which would really help out on those long shots. This is a minor limitation, though, to a great lens. If you have the discipline to learn how to use this lens properly (and if you can afford it!), you'll reap some great rewards.
Click Here to see more reviews about: Sigma 300-800mm f/5.6 EX DG HSM APO IF Ultra Telephoto Zoom Lens for Canon SLR Cameras
The Sigma APO 300-800mm f5.6 EX DG HSM Lens for Canon Digital SLR Cameras provides a constant fast maximum aperture throughout the entire zoom range and is optimized for digital SLR cameras. By continuously varying the angle of view from 8.2 degrees to 3.1 degrees, the lens takes a lot of the footwork out of picture composition.The multi-layer lens coating and lens design reduce flare and ghosting, which is a common problem with digital cameras, and it also creates an optimum color balance. Two Extra Low Dispersion (ELD) glass elements in the front lens elements reduce chromatic aberration to a minimum and also ensure sharp, quality images of high contrast. The lens' Hyper Sonic Motor (HSM) provide silent, high-speed and precise auto-focusing with full time manual focus override. The lens also features a drop-in 46 millimeter filter holder in the rear part of the lens barrel, which can be rotated to facilitate the use of filters, including a polarizing filter. Since focusing and zooming do not change its overall length, this lens is easy to hold and use. In addition, since the front of the lens does not rotate, a circular polarizing filter can be easily attached and used. This lens accepts both 1.4x and 2x APO EX Tele-Converters (sold separately).
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