Excerpt: Four stars based on price. Auto-focus a bit slow / inaccurate in lower light. When focus is correct, however, lens is very sharp. Does all you want an ultra wide close to do without distortion etc.
Summary: Bought this wide angle lens for shooting landscape on my Canon 6D. Didn't get much time to go out and take pix, but whatever pix i have taken so far looks good. I think it is cheaper than Canon.
Excerpt: Bought this to replace my Canon 17-40 f4 L. IQ is visibly better especially in the corners. If you do not mind carrying a much heavier lens that does not take screw on filters you won't be dissapointed.
Pros: Consistent Output, Durable, Rugged, Strong Construction
Excerpt: Superb ultra wide angle for full frame, especially strong in the 16-24mm range, gets weaker by 28mm. Stepped down it can deliver crisp sharpness even in the most extreme corners. I give it 5 stars due to the price/performance ratio. I shoot test charts and real world images to confirm chart results. My recommendation for this lens is for FX/Full Frame cameras. For crop sensors get something lighter and cheaper.
Excerpt: Compare with original Nikon or other brand, I gave it 4 stats. Auto-focus work fast and accurate with Nikon D600, It surprised me for the very low distortions on Conner of frame . Light distributed evenly from center of the picture to the edges. when I shoot from inside with room naturel light the area show on window have very cleared and detail. For outside, only Clair if I point it to see sun in the frame.
Pros: Durable, Fast / accurate auto-focus, Strong Construction
Cons: Difficult to Clean, Heavy, Needed Adapter To Fillter
Excerpt: I'll make it short and sweet. f2.8 to f4.5 not very good performance. Everything looked hazy(no it wasn't bokeh). f5.6 to f14 stellar performance, especially at 16mm. I don't see a reason to purchase the Nikon 14-24 over this unless it's absolutely imperative for you to have better f2.8 to f4.5 performance. Period.
Excerpt: Awesome wide angle for my 5D mk ii. Most people think it's a fisheye because it can sometimes have that effect but otherwise photos are very clear and make people look great. It focuses quickly most of the time. The only downside is the heavy weight.
Pros: Durable, Easily Interchangeable, Strong Construction