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Excellent image quality and a useful 77mm filter size. In addition, the constant 2.8 aperture is very useful and ensures a bright finder image. Don't buy this lens unless you really need an ultra - wide angle though. The zoom range is really rather limited so you will need to carry a 'standard' zoom in your bag too. It's also quite a heavy lens and not cheap either. The build quality is very good though. Another interesting feature is that the lens can easily be used on full-frame cameras as wide as 15mm, thus offering one a useful ultra wide angle option for FX and 35mm cameras - even if the extreme edges are a little soft on FX.
I bought this lens because I needed a wide angle lens with large aperture and it was cheap. It's a super lens consistency, fantastic shock resistant and impenetrable to mold or dust. Is performance compared with the original is the same, especially in regards to image quality and taking into account the price is certainly a plus.