Excerpt: Works great with the standard Canon DSLR 18-55mm zoom. Zoom out and you get the classic spherical fisheye effect that costs big $$$ from other sources (note- edge focus is NOT sharp, but majority is acceptable). Zoom in and fill the frame corner to corner with an EXTREME wide angle shot. For less than $50 I'm going to have a lot of fun with this. If you need super high quality photos, though, save your money.
Summary: This is a very good lens for practice and for fun. I did not want to spend $600 on a Nikon lens for fish-eye view only, I feel that is a waste since I am not aiming for fish-eye images. I would rather spend the money on a regular focal length Nikon Lens, even if it is over $2,000. Fish-eye is not my thing, but this lens definitely did the trick. I play around with it while my son plays soccer, on buildings, etc. It is a good lend to have in your camera bag, just in case.
Summary: The lens had no noticeable fisheye affect unless literally in your subjects face, which in my work means being lens to dog nose. Even when I tested it on more cooperative subjects - adult humans, inanimate objects - while I did get the described wide angle, still no fisheye distortion that created any interest. I'm a professional photographer and have worked with many adapters, but this one seemed to do nothing but add weight to my camera.
Summary: I can't go without a fisheye and I cant afford a true fisheye lens, and so this is a perfect solution. I just upgraded my digital SLR camera to the Nikon D7000 and had to get rid of all my old lenses and filters. I decided to go with this fisheye and I am happy I did. I think all photographers should use a fisheye from time to time just for kicks. It is so much fun to toy around with. The quality isn't AMAZING, but for the price it is perfect.
Summary: It is a cheap lens adapter, works but with a really low lens quality. The focus is only in the middle. If you want a lens to play, ok, but if you want to use to something serious, just chose a true FULL lens.