Let me begin by saying that I really enjoy skate/bmx/snowboard photography. To satisfy these, i've been looking into fisheye lenses for my nikon D50. I won't likely make this investment until after my trip this summer. I've done some research :study: and come up with a few options and would like to know your opinions on them. I have no bias, so I'd just like to know about the quality of these lenses. Mostly I'm deciding between the Sigma and the Nikkor: http://www.rugift.com/photocameras/peleng_fisheye_lens.htm (I have never heard of this before, but a google search brought it up. It appears to need an adapter of some sort. I can't tell, the english isn't very good.) http://www.rugift.com/photocameras/zodiak8_fisheye_lens_for_nikon.htm (again, never heard of this. Google brought it up) http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3255&navigator=4 (which can be found for under $500 here: http://www.preferredphoto.com/product.asp?id=sgfe840nk&l=yahooshopping) and, of course, the nikkor: http://www.bhphotovideo.com/bnh/con...138&is=USA&addedTroughType=categoryNavigation (which is $200 less expensive to buy imported. Why?) Opinions, suggestions, etc.