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Cons: Lens comes included with terrible QC, good luck getting a copy that isn\'t decentered to some degree AND doesn\'t have a broken AF motor out of the box. It will never focus as well as a Canikon lens. Doesn\'t work well with outer focusing points, making them useless. Focus ring pull is ridiculously short.

Pros: Cheap. Has OS that works pretty well. Seems like a good copy would be very sharp. has switches on the body to turn off OS and AF.

Summary: You might think this is the lens to get, and you might be right. It gets lots of great praise across the internet, so why not get it? It comes in the mail and you love it, works like a charm and produces great pictures.... oh wait, whats that? Why is the right side so blurry? You test for decentering and find the right side will always be blurry. You exchange it and another fresh copy comes to your door. You stick it on your test bench and find that it is still decentered but acceptably so, huzzah! You begin using it and taking pictures. Look, there goes your kid running and playing in the snow, lets snap some quick shots using AF... wait, what was that high pitched screech? And why did the AF motor hesitate during it? You try to reproduce it and find that in some situations the AF will make a nasty noise and freeze. You consider exchanging it again, but do you really want to wait even longer only to take another gamble? You decide to return it and get a Canikon lens instead. It comes in the mail and you, being jaded by the Sigma, begin thoroughly testing. To your surprise, you don\'t find anything wrong. The story ends - you have the lens you need, even though it isn\'t the lens you wanted in the first place.

Cons: Lens hood notch wears out. Need to move switch for manual focus override

Pros: Excellent all frame sharpness from F4 Excellent sharpness in center @ F2.8 Decent autofocus Very good all-round travel lens Reasonable weight Good bokeh Effective IS As good as the Canon 17-55 F2.8

Summary: I bought this 6 years ago. 2 years back my aperture stuck and the lens hood notch wore out. I had it repaired rather than getting a new one. I liked the lens so much. It had been around the world. This is my go everywhere travel lens. It\'s the only one I take on holiday. I have quite a few other lenses, but don\'t want to feel like a pack mule. In a dim cave, shoot @ F2.8 you\'ll get good results. Need super sharp landscapes you can shoot @ F4-11. I have a few primes and this lens is as sharp as those @ F4. This is also a good performer at outdoor weddings and with a speedlight in low-light. I have a friend with the Canon 17-55mm F2.8. That one is slight better on the edges @ F2.8 but this is superior from F4 and substantially cheaper. He did say he couldn\'t really notice the different in picture quality.

Cons: The Lenscap doesn\'t snap in place quickly, and the rotating focus ring is somewhat strange at times.

Pros: Fast, snappy, perfect colors, a real workhorse.

Summary: This lens made me a Sigma follower. I got it for an unbelievable 250 on a fair and I bought it knowing I could sell it if it wouldn\'t work for me. I spent half an hour of automatic AFMA using Magic Lantern on my 7D and the result is just awesome (-2 correction). Can\'t imagine any documentary shoot not carrying this lens.

Cons: back

Pros: cool

Summary: wiki.

Cons: Focus ring is moving during AF

Pros: Sharp and fast

Summary: I bought this lens mainly for indoor (low light) situation and for the case when I would like to have small DoF. I use it with a Nikon D5500 and I can only compare it to the Nikon 18-140 lens, which is my other lens in this focal range. The quality of the Sigma is nothing special, seems to me solid. The AF operation of the Sigma seems to me faster than the Nikon, which is also quite fast. (I have not made any real measurement, this is just my impression). I do not have any complain about the AF reliability either. The only negative is that the focus ring is moving during AF and you cannot use MF when AF is active. The OS works fine, but my impression is that the Nikon\'s VR is better. The image quality is good. With F2.8 the centre of the picture is sharp (as sharp as the images taken with Nikon 18-140), but there is some softness in the corners. If I use a smaller aperture (F4 or F5.6) then pictures are clearly sharper than the pictures taken with the Nikon 18-140. Even in the computer screen at 100% they are sharp. The DoF is working as I expect. The background is nicely blurred. I think the colours are very similar with the two lens. I was surprised how big is the difference between 17mm and 18mm. My feeling is that either Nikon 18mm is not really 18mm or Sigma 17mm is a little bit smaller in reality.

Cons: no cons

Pros: very sharp across range, very good in low light, quiet focus, good build quality. Images have good colour .

Summary: Very good quality lens, well worth the money and is my most used lens, used with both Pentax K5 and K3.

Cons: Pronounced barrel distortion

Pros: Beautiful colors, contrasty, good flare control, silent and reasonably fast autofocus.

Summary: Best value for money of f/2.8 wide/normal zoom lenses for DX Nikons.

Cons: Zooming in and out is opposite Nikon lenses Electronics visible, be careful at that point Af little noisy when using internal microphone

Pros: Image quality, accurate AF, durable (build quality), 77mm filter size, 2.8 in center always usable, OS effective.

Summary: Well done lens, optically and mechanically, zoom ring runs after heavy use still smooth. Bokeh is nice. Color reproduction and contrast will amaze you. No reason to buy 17-55 Nikkor without OS, or Tamron 17-50 if you are looking a 2.8 zoom.

Cons: Needs different finetuning adjustment for close range and longer distance (at higher focal length). No manual focus override. Small manual-focus range (about 30 to 40 degrees) Lenshood is hard to remove, I am almost afraid to break the moving part of the lens.

Pros: Really sharp. Nice colors. Wide enough and still able to take a portrait shot. Focus quickly. Fast lens (2.8) for freezing baseball shots. Great for low light due to stabilisation. (When object is not moving.)

Summary: Very good lens, still my only one. Not expensive (Dropped to 400euro in price, just after I bought it for 600.-)

Cons: focus ring moves when focus.

Pros: the price, compared with Nikon and cannon

Summary: sold my Nikon to get this beauty, NO REGREETS

Cons: This lens is worth nothing. Sigma was NOT able to manage the focus problems. I had got 3 different lenses 17-50, all the same. Its a shame.

Pros: Naturally colours, but its worth nothing with a wronf focus:(

Summary: DONT buy this lens

Cons: Great Lense, constrution very similar to L lense without weather sealling. At 2-8 Extreme border little soft but from F4 is a fantastic lense, warm color, AF very fast an accurate (faster them my old 17-40 F4 L ...big surprise for me) In APS in this range one of the 3 best lense available.

Pros: No Full Manual focus if that bored you.

Summary: Recommend strongly for any APS. Very similiar to Nikon 17-55 2.8 and Canon 17-55 2.8 IS, but like canon has te OS a big advantage over Nikon!

Cons: whole electronics is visible from rear end. soft images on borders. very short manual focus ring rotation- accurate focusing is difficult. in low light AF hunts. no FTM.

Pros: excellent warm color reproduction. near silent AF & OS works. very sharp on middle of frame. good contrast. compact with good build.

Summary: reasonable price & it itself a very good lens. as good as canon 17-55 f2.8. Try it !

Cons: There is an occasional squeaking sound when the lens zooms in and out. No full time AF.

Pros: Excellent optical quality and resolution. Just printed a 20x30 and a 12x20 which were taken handheld and they look excellent. The OS works well and the AF is solid. Recently used the lens at a HS hockey game and the lens kept up with the action. Obviously the f2.8 is great to have and why the lens costs what it does, otherwise the lens would be half the price. The lens is solidly built and more compact and lighter than the Canon equivalent. The price is what sets the lens apart. This lens is a great buy and matches well with my 7D. Sigma even includes a lens hood and a nice case with the lens.

Summary: Sigma has a winner here. Go to a shop and directly compare the Sigma to the Canon. Hold them, take some test shots, compare prices and then decide. This Sigma has allowed me to get photos of my children that would not have been possible without the f2.8, HSM and OS. This is a great lens and very highly recommended.

Cons: For my copy, an unusual faint noise while zooming, just noticed it after a month of using it. No manual focus override when in AF mode. When in AF mode, focus ring moves.

Pros: Image quality, contrast are excellent. AF is fast and accurate. But since this is a variable lens, the focus result is sometimes not correct due to changes in the focusing plane of the lens itself. Built of this lens is excellent for the price you pay, i like the size and compactness, weight is a little heavy but is fine due to expensive glass used.

Summary: Excellent lens for the half price of other major brands like Canon, etc.

Cons: Awesome sharp from 2.8 can be a little soft at extreme edge, but with that conditions of light only Canon L IS Lense on a full frame can do same!!! Good build quality (like L lense)Very sharp at the center at all focal lens Sharp across the frame when stopping down to f4

Pros: No manual override focus

Summary: Get ride off my 17-40 F4 L and very pleased with this Sigma and would recommend to anyone. Couldn't use the Canon in interior, only with flash build-in off the camera Is as good or better as similar Canon 17-55 2.8 IS for a little more than half the price

Cons: Dust easily stuck on lens body - harder to clean

Pros: Sharp, Contrasty, OS works, Value for money, Good build quality

Summary: Best price performance compared to Nikon 17-55, Tamron 17-50, Tokina 16-50

Cons: focus ring turns during autofocus. no full time manual override like in other HSM lenses. Lenshood is not very well done and appears to be of cheap build quality.

Pros: Very sharp, even wide open. good build quality. well working optical stabilization. pretty quiet autofocus due to HSM

Summary: Had the Tamron 17-50 2.8 non OS before an d sold it after a week. The Sigma really delivers in terms of sharpness and autofocus speed (two thing where the Tamron failed me). On top having OS is a nice feature

Cons: No full-time manual focus, but at a considerably less price point than Canon 17-55/2.8, so this is ok. Occasional mis-focus, but keeper rate is satisfactorily high.

Pros: Somewhat soft from f/2.8, but usable and becomes noticeably sharper by f/4. Quiet AF. Wonderful colors and contrast.

Summary: I use on Canon APS-C. This Sigma beats the socks off the Tamron 17-50/2.8, which I owned and despised due to its loud AF and that the Tam hunted for focus in low light. I like that it's a much more compact lens than the Canon 17-55/2.8.

Cons: Awesome sharp from 2.8 and across most the frame Light weight lense

Pros: None for this price

Summary: Highy recomend, a little better them the 17-40 F4 i had before

Cons: Focus ring rotation in front if that upset you. No manual focus override, but the button for change it in a good position.

Pros: Amazing sharp at center from 2.8 From F4 is sharp from center to extreme border, the OS works very well.

Summary: Very sharp lense with and Extra L sharp at center, very fast focus. I´ve tested in low light and it was great no back focus. Recomend for sure

Cons: A little heavy

Pros: Very sharp, autofocusses precisely. Affordable 77mm filter diameter. Build quality seems very solid.

Summary: Very happy with purchase; this standard zoom takes photos that match up to the quality from my prime 30mm and 50mm lenses

Cons: That focus ring...

Pros: Excelent image quality, good AF, good stabilization

Summary: Probably the best ratio price/quality in this category

Cons: Clumsy manual focusing

Pros: Seems as good as similar Canon for a little more than half the price.

Summary: Nice piece of glass

Cons: Not weather sealed

Pros: Solid build lightweight compared with Nikon Close minimum focal distance Sharp? OMG - this lens is sharp HSM v quiet and quick

Summary: This is a really excellent lens - great value for money but not at the expense of quality

Cons: AF not accurate on 17mm

Pros: Sharp wide open, OS

Summary: Focus on 17mm is lottery

Cons: Soft image at the frame edge at wide open Focus ring rotates during AF No full-time override manual focus Focus not so accurate at widest angle

Pros: Good build quality Very sharp at the center at all focal lens Sharp across the frame when stopping down to f4 onward Small and light Lens hood included and nice soft case

Summary: Good quality and recommended lens for its price.