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This lens replaced a Canon 300mm F4 L IS lens that I just got but returned due being completely out of center. Now, the Canon should be a great lens when properly aligned, but it left a bad taste (and this is not the only Canon L lens I bought that was not in good alignment) and prompted me to look elsewhere. There really are not a lot of options for 300mm and F4 (and I don't want to spend thousands more for an - admittedly - stellar F2.8 lens) and I stumbled on this zoom lens. Usually, I don't go for zoom as I prefer better image quality over versatility. But the used one from amazon warehouse deals was a good price and worth a try.

First, the used lens came in very pristine condition with caps, case, and manual. Just a few minor marks on the hood, but the matte finish is kind of sensitive to it. It's a solid and heavy lens with excellent build quality. Turning the well dampened focus or zoom ring is addictive and so much more pleasing than any L lens I ever owned or tried.
Auto focus is fast, though a range limiter could have been useful. Focus accuracy is not the best without micro adjustment, but pretty good after adjustment (still a little short of good L lenses, but at least close). Live view focus leaves a little to be desired. It causes the HSM to stutter back and forth noisily before setting on what wasn't always the correct focus.
Image quality turned out to be quite nice. So far, I focused on the long end for checking the lens out in detail. While the Canon 300m F4 L IS has better edge sharpness, they are on par in center sharpness. The Sigma shows a bit more color aberration on the edge, but does very well with coma and astigmatism. And it goes down to 100mm, something the Canon can't. At 200mm, image quality is even closer to prime (such a 200mm F2.8 L II lens), at least at first look.
I noticed it's a little more daunting to hit focus on closer subjects wide open. Often, you walk a way with a soft image. Focus at infinity is a lot better. At closer distance, I usually stop down, which fixes this one. Vignetting is also a bit high, but this is easily fixed in PP. Bokeh is pleasing and much better than on my 400mm F5.6.
Overall, I am very happy with this lens, both on an APS-C and full-frame body. If you can live without image stabilization (I can), this i a great lens, and it gets harder to find...

Heat lens but gets pretty soft wide-open at the long end. Great build/construction.

I bought this lens to use with my Canon 30D for high school sports (soccer, football, baseball, etc). I already had the  Sigma APO 70-200mm f/2.8 EX DG HSM Lens for Canon Digital SLR Cameras  and needed more focal length. Like the 70-200 F/2.8, this lens is big, heavy, and built like a tank. The bare lens is about an inch longer than the 70-200, but the 100-300's hood is longer than the 70-200's hood.

The zoom and focus rings are wide and move smoothly with just the right amount of resistance. This lens is sharp wide open. At the overlapping focal lengths, the 70-200 at F/4 is just barely sharper than this lens at F/4 (wide open). At 200mm, this lens is actually sharper (200mm is this lens's sweet spot.) At 300mm, the lens is still sharp wide open, but I like to stop down to F/4.5 just to keep things super-sharp. Up to 250mm, I would not hesitate to use it wide open.

This Sigma lens has HSM which means the focus is fast and quiet. The lens focuses a little slower than the 70-200 F/2.8, but I've found that the 30D is more of a limiting factor in focus speed than the lens is. Servo tracking is very good with this lens, the only time it can't keep up is when track runners are sprinting straight at me (although again, I think the body is the limiting factor here.) For almost every other situation, the focus will definitely keep up.

All in all, this is not an indoor lens by any means, but as an outdoor sports (or wildlife/nature) lens, it is awesome.

I bought this lens over three years ago, it is probably my most used lens for birds and wildlife, super fast HSM, extremely sharp images, short focusing distance which allows it to be used as a semi macro lens. I have the Canon 70-200 L non is version and find that Lens is regulated mostly to portrait shots when distance is a necessity. Cons if any is the size and weight but no so heavy that it can not be handheld.

perfecto algo pesado pero perfecto

High build quality, sturdy, easy to use. Excellent picture quality. Works great for sports, wildlift, mood photos of people in an urban setting.

Just about my only complaint about this lens is its size and weight. It is big, it is heavy, and not very handy. But it does everything I have used it for really well.

I have not seen anything in this price range with the same quality and appraisal as this lens.
Definitely one to recommend.

I bought this lens because the Canon 100-400mm was alittle to much for my pocket book. I have had the lens over 5 months and used it mostly outdoors with a monopod. A monopod is a must, Living next to Yellowstone Park I use this lens alot, however it is alittle heavy, and needs alot of light to get a perfect picture. Its not a L lens but it has its qualities that are very close, this lens doesn't get the attention it deserves for outdoor photography.

If you are looking for a good F4 lens without spending over $ 900.00 this is a good alternative. If you shot in low light tripod is a must.

Overall I am very happy with this lens, I would give it 5 stars if it handled low light better.

掲載されている商品ではなく、旧モデルが送られてきた。発送元に問い合わせたところ、勘違いしていたとのことで返品しました。返品時の対応は誠意あるものでしたが、返金についてはamazonサイドの規定に従わなければならないとのことで、amazonからは現金振込みではなくギフト券対応されました。それでは困るのでamazonに電話連絡して振り込み手続きをしてもらいましたが、振込みまでかなり時間がかかりました。この点は少し改善してもらいたいところです。