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Cons: Soft focus (edges) most specific with open aperture. Part of this because it the AF seems to be off a bit. Because of this I later bought another wide angle lens.

Pros: Feel solid, must have some glass in it. Nice range of focal lenght if you shoot outdoors (land- or cityskape).

Summary: I read a few commands and the opinions about this lens seems to vary widely. Appartently if the AF is not off people tend to be rather postive in their commends. So, if you have trouble with de AF then focussing manualy might be usefull.

Cons: Very soft on the edges. AF not very acurate, awfull flare and contrast drop, manual focus ring loose, extreme vinieting on 17mm 2.8

Pros: Cheap, covers ff

Summary: Only if you really can't afford sth better. It's been nothing but disapointment on my nikon D800.

Cons: plastic construction

Pros: sharp optics, low flare. good match for 6 mega pixel cameras. i didnt notice any purple fringes in corners even at 4x mag. minimal WA distortion except expected perspective.

Summary: sigma lenses are a great value used.

Cons: Edge sharpness Occasional fidgety autofocus

Pros: Very good centre sharpness. Price (second-hand) Full frame coverage.

Summary: Purchased mine pre-used on Ebay, as I'd just bought a Canon 5D and needed a lens to produce a similar angle of view to that of my Sigma 10-20 on my 40D. Compared to the 10-20, which is acceptably sharp across the cropped sensor, the 17-35 seems to have a problem with DOF on the left side of the frame, (more so than on the right) I have read somewhere that there could be a tolerence issue with the lens mount, where the lens could be slightly off 90 degrees and causing the problem of focus fall-off. The solution is to be aware of the issue and compose shots with that in mind.

Cons: Exterior texture, 77mm filter, front or back focus sometimes, soft borders (manly in full frame).

Pros: Accessible "PRO" wide angle, sharp when in focus, good look (with distance window), comes with case and lens hood.

Summary: It´s a good lens for landscapes or street or even at home or studio with good flash light. It produces good images but not always.Sometimes it is difficult to have a sharp shot with flash at f/2,8 or f/4. In full frame I think it is very soft.

Cons: Light falloff, not really f/2.8 @ 17mm, not that sharp wide open, bulky, HSM focus system is vulnerable and not that accurate, mine kept making weird sound for about 3 months, then it stopped, a friend of mine had the same "feature" but in the end the focusing stopped working!

Pros: Well build & damped, very cheap secondhand, not bad distortions, covers FF, skip on DX, gets sharper from f/4 ->

Summary: A cheap alternative for real FF wideangle monsters like 14-24 or 17-35, falls a bit short but for the money it does everything it promises.

Cons: 17-35 can be too short Needs 77mm filters

Pros: Sharp Quiet and accurate focusing (Nikon) Excellent build quality Price FULL FRAME !!!

Summary: Great lens, on DX you get 26-50 with good sharpness across the range. Works also with full frame cameras.