LensTip.com

Cons: Un-sharp, kit lens sharper. Stopped down sharpness is a little better, but not better than the kit lens. Back focusing at F/4, rest was okay. Screw drive AF for Pentax noisey. Plenty of vignetting.

Pros: Goes wider than a kit lens. Cheapest wide angle lens.

Summary: Horrible lens, extremely disappointed. Got rid of it and paid double the price for the Pentax DA 12-24 - huge leap in quality and so much more happier.

Cons: Not good at all wide open. Ok, at f/11. Some difficult flares.

Pros: Build Quality is overall good.

Summary: Use only with good high ISO Cameras or Daylight or Stativ.

Cons: High vignetting and barely acceptable sharpness at maximum apertures. The maximum aperture changes across the focal length range.

Pros: Good overall sharpness at f/8-11. Very good build quality. Silent, quick and accurate autofocus system. Lens pouch and hood included. Fair price.

Summary: Good overall quality and one of the best price performance ratio for Canon aps-c cameras.

Cons: Corner sharpness, Quality control

Pros: Price. Wide!

Summary: Disappointed with this lens, on a 40D and even more with a 7D showing off it's optical deficiencies. Two trips to Japan(!) to remedy de-centering and then a lens element flaw improved things, but not to the levels many reviews suggest. If you like your kit lenses you will be content enough with a 10-20, if you are used to better glass you may be dissapointed, especially on higher MP bodies.

Cons: sharpness in corners is weeker

Pros: very sharp in center, quite quick AF, very good build quality, price

Summary: This was my favourite lense on PX untill I changed the system.

Cons: relatively slow lens

Pros: very sharp and pleasure to use

Summary: A great lens

Cons: Slow. Sigma's bad reputation on quality control. They say there are some bad samples out there.

Pros: Quite sharp and good build quality for the price. Great usability.

Summary: I ended up selling this due to little use after purchasing the Tokina 116. However, I found this sharper in the wider zoom-end, and also better towards bright light. A good lens!

Cons: Some vignetting, but correctable in software

Pros: Excellent build quality and ergonomics. Fun and easy to use.

Summary: The quality is much greater than the price. Excellent value.

Cons: Weak directly against bright light (but that's normal for ultrawides), limited fastness, vignetting at 10mm, edges could be sharper at max aperture

Pros: Decent build quality, good quality at center of frame on large apertures, good quality at edges from f/8 and smaller, generally good contrast and colors, fast and reliable autofocus

Summary: This is probably one of the best ultrawides for dx (with the noteable exception of the tokina 11-16 which unfortunately doesn't have an autofocus motor). Good image quality for most purposes, especially outdoors when you've got enough light to use a smaller aperture.

Cons: Mine is a little decentered but nevertheless it doesn't have great corner sharpness, but reaches acceptable levels at f/8 and good at f/11. This is the only minus point in this lens.

Pros: Good center sharpness from f/5.6 and up, great color rendition and flare resistance, good contrast and perfect exposure all the time. Excellent build quality, very silent fast focusing. Very well controlled distortion for a wide-angle lens!

Summary: It's a pleasure to use this lens, the build quality is fantastic, and I'm always sure that the exposures are spot on and with great color rendition. I use the lens hood all the time to prevent flare and to provide a way to protect the front element.

Cons: Vignetting, but easily removable in PP

Pros: Build quality, sharpness, generally every aspect is at least above average, price

Summary: Maybe some of the newest wide zooms are slightly better, but Sigma 10-20mm f/4-5.6 EX DC HSM has the best value for money ratio!

Cons: Considerable geometric distortion in some circumstances but this is mostly due to the sort of lens it is.

Pros: Excellent build quality. Everything has always operated well Unique finish stands up to frequent use surprisingly well Well and truly sharp enough for my purpose Wonderful depth of field Dramatic images No focusing issues, ever.

Summary: All lenses work least well wide open. This is no exception. Most lenses are sharper toward the centre. That is mostly true of THIS lens as well. I have shot the interior of hundreds of houses with this lens and am perfeclty happy with the results. It stands up well to frequent use and provides me with spectacular images. I don't shoot test charts and optical compromises have never been an issue for me.

Cons: corner shading is noticeable but manageable.

Pros: sharp lens. Though not a fisheye lens the distortion at the edges gives a unique perspective to composition. very wide angle view!!!

Summary: Fun to use, great compositions, lighter on the budget. lens worth buying!!!

Cons: Sometimes there's a problem with focusing, and it keeps on trying for several seconds. Some photos are not very sharp towards the edges.

Pros: Fantastic dramatic landscapes. Good colors. Makes it very easy to find a good composition.

Summary: Whether it's for in the city, or outdoors for landscapes, this lens hardly leaves my camera. I had to choose between spending money on a wide-angle or a tele-zoom, and I made definitely the right choice!

Cons: strong cornershading

Pros: nearly without cromatica aberrations, very sharp, very wide, only little cornerdistorsion

Summary: I got the older Pentaxversion without the internal scale-window. And this version is the REAL one, very sharp, beautiful coulors. The new version is NOT so sharp, I had as well a 4/3version and I know, what Iam talking about - I sold it....

Cons: I have problems with decentering. Left edge of frame has more CA and it's not quite so sharp as right edge. I've sent lens to Japan for repairs but it came back with same problems.

Pros: Wide angle, wide angle, great sharpenss in center, very fun lens to use.

Summary: Be sure to check this lense before buying. If you fing good sample buy it :)

Cons: Some field curvature at the edges Other website/listservs cite uneven manufacturer quality control, especially decentering Lens hood does not engage easily (minor)

Pros: Great landscape lens Color transmission, without filters, is brilliant

Summary: A great lens for all super WA zoom purposes purchased at what was a great price. Original equipment prices for comparable Canon/Nikon items are twice as much and probably afford only slightly better image quality, if even that.

Cons: This is EX lens, and I expect excellent quality. After a 6 months of usage, zoom ring started rotating too easily. I prefer its initial resistance. This is why only 4 for build quality was given. I feel it steels some parts of blue-green spectrum, but I have to wait for transmission tests on lenstip.com to confirm.

Pros: True wide angle for DX/APS-C users. Very good distortion performace (for such a crazy angles).

Summary: It nedds to be stopped down to f/8-11 to get really sharp images. But it offers usefull quality for all apertures. Another must-have lens for DX/APS-C user. Best used outdoor. A piece of my weekend packing routine: D300 +N1.8D +N70-300VR + S10-20 :-)