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Rating: 
Summary: Great lens, but experiencing problems
Review: ...I used the lens at a wedding and it was just perfect. It's a little tough on the focusing and the zoom but that's ok at least I know it's going to stay put. I can't wait to use it on my digital SLR and see how it looks.
Rating: 
Summary: Great Lens.. Unaware Amazon.com
Review: ...I used the lens at a wedding and it was just perfect. It's a little tough on the focusing and the zoom but that's ok at least I know it's going to stay put. I can't wait to use it on my digital SLR and see how it looks.
Rating:
Summary: Great lens, but experiencing problems
Review: I enjoyed this lens very much when I got it. Problem is that it's Auto focus isn't working on my Canon EOS-5. It worked fine in the begining. It's not now. I'm going to send it in and see if they fix it and if it works well afterwards. Never been dropped and hasn't been used all that much. Not sure if it's just mine or if others have had this problem. It might need to be reprogrammed. Buy with caution.
Rating:
Summary: So nice I'm getting one twice
Review: I had the Canon 35-80 and 22-55 zooms for my Rebel. They're very small and super light but feel flimsy, and they are fairly "slow" lenses, meaning no low light or really shallow depth of field. I bought the "faster" Sigma 28-105 from Amazon earlier this year. It's bigger and beefier than the "stock" Canon EF lenses. It looks quite respectable, and it feels very sturdy. I cvan't speak to the finer points of its accuracy, but the Sigma's ideal range and low aperture capabilities made it, for me, the only lens I'd ever want for the Canon - what a nice, simple, handy system!
This summer, I took a spill into Lake Powell with the Rebel and the 28-105. Ooops! Youch! I may try to fix the water damage, but I'm getting another Sigma 28-105 right away, so I won't be without a reliable one, factory fresh. It's that good. I wouldn't want to be without this lens as THE BEST compact backup system to my more cumbersome and finicky medium format Mamiyas.
Rating:
Summary: pound for pound the best 28-105mm lens on the market!!
Review: I purchased this lens about a month ago! From the moment I took it out of the box I knew this was going to be a great lens! the construction of the lens is solid! it uses a 82mm filter wich lets a lot of light in! this is good for indoor pics, and also keeps your pics bright and sharp! I also own the Sigma 70-300 APO
and I use the 28-105mm about 75% of the time! I use to use Canon lenses exclusevly! but after reading reviews and experincing Sigma quality for myself! I now use Sigma lenses "Exclusively"
These lenses could go head to head with the big boys "canon & nikon" and beat them every time on price, and tie if not beat them in photo quality! I highly recomend Sigma.
Rating: 
Summary: Terrible distortion at both ends of zoom, inaccurate AF
Review: I wish hadn't bought this lens. At the long end of the zoom, pics look like walls and similar lines are bowing in and and falling forward. At the short end, extreme lenghtening of lines 45 degrees and closer--e.g., reclining figure ten feet away, at standard 45 degree diagonal across the picture, looks as if feet are longer than the legs they're on. AF is accurate maybe 2/3s of the time. What a complete waste of money.
Rating:
Summary: Be Careful
Review: I'd love to review this lense, unfortunately it isn't the one that I received. I purchased this lense, but received a much slower 28-105mm F3.8-5.6 UC-III lense instead (62mm filter). Make sure you get the actual lense you are paying for.
Rating:
Summary: fastest, highest quality zoom lens for the price.
Review: This Sigma 28-105mm is superb value for a general-purpose lens for the serious amateur. The zoom range is great, and the quality of images is fairly consistent throughout. It's faster than any other lens that you'll find near this price (meaning that it has a larger aperture to let in more light, so you could take the same picture at a faster speed).
When I was purchasing it, the biggest question on my mind was whether to get a Canon lens or an off-brand lens. The most similar Canon is a 28-105mm f/3.5-4.5 USM. It costs about a quarter again as much as the Sigma. Advantages of the Canon? It offers USM (fast, silent focusing), and the Canon logo. Advantages of the Sigma? An extra half-stop, and price. Personally, I don't find the lack of USM to be much of a disadvantage. The focusing is quick and precise on the Sigma -- unless you're taking action shots, you're never going to notice the extra half second. I do like the speed of the Sigma. Having an extra half stop allows you to shoot in slightly dimmer light, or to achieve a shallower depth. Since I haven't done a side-by-side compison of shots from the two lenses, it wouldn't be fair to compare their quality. However, I'm absolutely happy with the Sigma -- it goes far beyond what I expected for a lens of this price.
Just to clarify a couple of errors in other reviews: it uses 72mm filters, so be aware that you'll pay more for these than for filters for the Canon. (On the other hand, this allows the lens to be faster and to have fewer problems with vignetting.) There was a problem with the older Sigma lenses being incompatible with newer Canon EOS cameras, but newer lenses solve this problem.
Overall, I think that Sigma offers superb quality and versatility for the money. If you're a serious amateur who is looking for that one lens you keep on your camera 90% of the time, this is the perfect lens for you.
Rating:
Summary: Awesome zoom for anyone but a pro
Review: This zoom has a very handy range for all types of shooting. Its expecially helpful during the holidays, since lots of people are usually crammed into a small house. I have taken many rolls of pictures over the last 2-3 years with this lens and had NO problems. Zooming is smooth and focus is quick and quiet.
Rating:
Summary: Awesome zoom for anyone but a pro
Review: This zoom has a very handy range for all types of shooting. Its expecially helpful during the holidays, since lots of people are usually crammed into a small house. I have taken many rolls of pictures over the last 2-3 years with this lens and had NO problems. Zooming is smooth and focus is quick and quiet.
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