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Alternatives

Assuming you are looking for a Nikon mount ultra wide angle, then your best bet is to evaluate the current lens lineup from Carl Zeiss, and most specifically Carl Zeiss Distagon T* 21mm f/2.8, which in many users mind is the ultimate UWA lens out there. Both Canon and Pentax users are also in luck here, as Carl Zeiss offers this lens in EF as well as K mounts. However, if you don't want to spend ~US$1,500 for this lens, then the only option for you is to look into older Nikon lenses. The 20mm Nikkors (both older Nikkor 20mm f/2.8 Ai-S, Nikkor 20mm f/3.5 as well as newer AF Nikkor 20mm f/2.8D versions) offer decent quality once stopped down to f/5.6 and below at a reasonable price. 18mm Nikons, including Nikkor 18mm f/3.5 Ai-S and the newer AF Nikkor 18mm f/2.8D fall into same category. If you're a Canon or Micro Four Thirds user. then you might want to look into the now discontinued 21mm and 18mm Olympus OM lenses - Olympus OM 18mm f/4, Olympus OM 21mm f/2 and Olympus OM 21mm f/3.5.

 

Recommendation

Voigtlander Color Skopar ASPH 20mm f/3.5 fell short of my rather 'elevated' expectations. This does not mean you should automatically toss it away and forget about it. The lens certainly did not come even close to matching the performance benchmark set by Carl Zeiss Distagon T* 21mm f/2.8 or even the Nikon's ownn AF-S Zoom Nikkor 14-24mm f/2.8G. The lens also exhibits a number of other usual to UWA lenses issues like  vignetting, flare and distortion. So, generally speaking, you'd want to stop down the lens to about f/8 to get really good results.The lens does offer superb build quality and more importantly sports a really compact overall size, so if you like to travel light or use a small sensor camera which is not as demanding on the lens, then this lens is for you. Otherwise, it is doubtful you will  get a lens that is any better then a number of other, more mainstream lenses like AF Nikkor 20mm f/2.8D for example.