Well worth the price for a wide angle lens
592517
Great Lens for all photographers and film makers. I do a lot of time lapses and this is one of my primary go to lenses.
2031157
This lens is a wonderful wide angle lens. It's light weight, focuses fast, and is nice and fast. Wide angles are lots of fun for close up work and this lens focuses down to 5.5 inches. Shooting groups indoors this lens allows you to capture the whole group. If you user Nikon's Capture NX 2 software you can un-wrap some of the distortion introduced if you wish. Attached to my Nikon D90 it takes amazingly sharp and vibrant photos and makes fun distorted video clips.

<a data-hook="product-link-linked" class="a-link-normal" href="/Nikon-Capture-NX2-Photo-Editing-Software-CD-ROM-Nikon-Pro-Cleaning-Kit-Spudz-Blower-for-D3-D700-D300-D200-D60-D40-D80-Digital-SLR-Cameras/dp/B001CDUX74/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Nikon Capture NX2 Photo Editing Software (CD-ROM) + Nikon Pro Cleaning Kit & Spudz + Blower for D3, D700, D300, D200, D60, D40 & D80 Digital SLR Cameras</a>

<a data-hook="product-link-linked" class="a-link-normal" href="/Nikon-D90-12-3MP-Digital-SLR-Camera-Body-Only/dp/B001ET5U92/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Nikon D90 12.3MP Digital SLR Camera (Body Only)</a>
1611684
Love this lens and a great price. I use this lens mostly for vlogging and it gets me the wide shots I want
3756539
It's a great wide angle lens alternative to the name brands. I use it mainly for landscape and interior photography and it does the job perfectly. If you have a full frame camera might not be the best option, but for the price it's fantastic. Not as sharp as i would love to, but again, $1,000 cheaper.
1635580
It's actually very good for a 30 dollars lens. I was very skeptical at first given the low price, but after receiving it i was very pleased with it. It clearly doesn't compare with a "real" 600 dollars wide angle fish lens but this one really exceeded my expectations. One thing to keep in mind is something someone posted before:

"although the macro lens works by itself, the fisheye does not; you need to have the fisheye threaded into the macro lens to attain focus. Even when used together, you can get a good deal of up close work done, keeping in mind that sharp focus will remain in the center of the frame"

So, if you can't afford or if you are not willing to pay 600 dollars (or more) for a "real" fish eye lens, then this is a very good option if you want to get a fish eye effect and play around with your camera a little bit; But if you are looking for a professional fish eye effect, then this is not what you are looking for.
1846220
Its really fun to shoot with a wide macro. This lens is exceptionally sharp, tiny and was priced right. I only wish it was weather sealed like the 60mm
665936
This lens is very versatile, offering good wide angle to a good head-and-shoulders portrait length.  It's internal focusing, which helps with speed and close-focusing performance, and has image stabilizer for better low-light performance.

The IS can be of a particular benefit to those that shoot in darker open areas, like wedding photographers in churches.  The IS, combined with a flash, can allow use to get more background detail for indoor events.  No longer do we have to accept dark, dungeon like backgrounds!

Ideally, the lens would be a little bit brighter (say, f4 at the top end), and a bit heavier built.  But then again, we could have that for $1,000 more!
1003808
Great lens. Very nice wide shots. Not the single sharpest photos in the world, but that should be expected with wide angle like this for the price
1864552
Ok wide lens but the macro lens is even better.
4825841
I purchased this for a Meade Polaris 130mm EQ telescope.  I have only used it a couple of times but I like the clarity wide angle view and eye relief this lens provide.  Very good for locating points of interest, fine tuning the telescope then switching to higher magnification lenses.  Well worth the purchase price.
77752
Talk about a wide angle lens, this is it.  If you're in Real Estate this is a must have!
3454912
I have had this for a while. I must have taken a thousand shots by now. I can admit that this is a superb lens considering its size and price. great center sharpness wide open. gets better as you stop down a little. Makes a lot of noise when focusing in low light. Not much to complain about but, worth noting. You will hear it in your video for sure. love the lens so far.
977360
I purchased this lens after looking at the Canon 17-55 2.8 and the 15-35 L lens.  In the end, I went with this lens because it seemed to provide great value for the price.  I have not been disappointed.  All in all this is a great lens.  It can be a little soft when it is wide open at 2.8 and and at 17mm, but it sharpens right up if stopped down a little bit. I was fortunate to get a good, sharp copy, and this lens has become a great walk-around lens.

I have it paired with a Canon 70-200mm 2.8 Mk II and a Canon 50mm 1.4 prime, and I feel like I have almost all of my bases covered.  Now for that 100mm macro...

I would recommend this lens to anyone looking to add a wide angle zoom to their EOS kit.
1310416
I've chosen to use this lens as my primary lens, been shooting a lot of portraits lately and at times need a very wide angle lens for larger group shots. Love that I've got the ability to choose various apertures for depth of field effects. It's a bit heavy and I have experienced a little bit of lens flare when wide opened, but proper cropping will help to eliminate it. Very good lens over all and worth every penny spent on it.
159381
Wide angle lenses are extremely useful for shooting large objects (like buildings) in congested areas. You simply cannot stand far enough away to get the whole thing in the frame if you are using a normal lens. This sort of lens is also great for shooting indoors when you want to photograph a large group in a small space.

One quick word about focal lengths on 4/3 cameras. A 9-18mm lens on a 4/3 camera will provide the same viewing angles as an 18-36mm lens on a 35mm film camera because the sensor is smaller than a 35mm film frame. So 4/3 will have a 2X "crop factor." 18mm is considered very wide. 36mm is almost a normal view. You probably already know this if you are reading this review, but some new 4/3 users may not be aware of it.

With this lens Olympus has given us an alternative to the $1700 7-14mm f/4.0 at less than 1/3 the price. It's not quite as wide, and the build quality isn't as high, and it isn't weather sealed, but it's also only $500. The important thing is that image quality is really excellent.

I really love using this lens. It is lightweight and focuses quickly on my E-30. And it lets me reach way under my 14-54mm lens when I need something wider. The difference between 9mm and 14mm is HUGE; much more than you might think. A 14mm lens gives you a 75 degree angle of view. Move to a 9 mmm lens and you now have 100 degrees of horizontal view. Those 5 extra milimeters give you a 30% wider view!

The other end of this lens - 18mm is "narrow" enough to be very useful as a walk around lens for street photography. So you can go from "pretty wide" to "normal" without swapping lenses when you are visiting tourist spots or new cities. This is one of my favorite lenses and I get good results using it. See my sample images!
610924
Great wide angle lens.  It fits my Panasonic video camera and creates an excellent vignetting.  I use it for outdoor action shots like skateboarding videos.
3929860
This lens is very well built. The construction quality is excellent, the focusing is silky smooth, and the photos are razor sharp. I have found a bit of chromatic aberration at full apertures and the lens is a bit softer also when wide open. Just stopping down to 3.5 seems to get rid of the CA and the lens sharpens right up, as well.
The lens is a little sluggish when focusing in very low light (i.e. situations requiring high ISOs and/or slow shutter speeds). This lens is VERY wide, so expect some typical wide-angle distortion. The distortion is very pleasing, not as much as a fish-eye and easily "correctable" using Photoshop if desired. I even created an action for it and it works flawlessly.
I used this lens on an Xti Body and a Elan IIe film camera (because I want full frame sometimes and can't afford the 5D). The photos were outstanding and the lens is VERY VERY wide on full frame.

Here is my brief analysis of this lens:
1) Nearly as good as the Canon L equivalent
2) Outstanding build quality
3) Use the lens hood in bright light or expect lens flares
4) Normal wide-angle distortion, no barrel distortion and nothing unpleasant
5) Very sharp images f/3.5 or smaller
6) Use high-quality filters only or expect flares
7) Silkiest focus ring I have ever used
8) Use manual focus for night shots or very low light