http://www.nikonchat.com/nikon-d40-lenses-macro/

Is this a fisheye lens for Nikon D40 good?
http://cgi.ebay.com/0-42X-FISHEYE-LENS-W-MACRO-FOR-NIKON-D50-D40-D40X-D80_W0QQitemZ120336397111QQcmdZViewItemQQptZCamera_Lenses?hash=item120336397111&_trksid=p3286.c0.m14&_trkparms=66% 3A2% 7C65% 3A15% 7C39% 3A1% 7C240% 3A1318 who know nothing about camera lenses, but I know I want a fisheye / wide angle lens. Will this goal? Is there something that works better?
That blows goal. It is an incredibly inexpensive item that screws into the front of your current zoom lens. Al least, that's the idea. If you are using Nikon 18-55mm lens (with 52mm lens thread), this post without a name (with 58mm lens thread) does not even fit. You will have a step in the ring to be purchased separately and hope for the best. Any of these Nikon or Sigma lenses would be much better: http://www.bhphotovideo.com/bnh/controller/home?ci=0&shs=nikon+fish+eye&sb=ps&pn=1&sq=desc&InitialSearch=yes&O=jsp% 2Fproductlist.jsp & A = search & Q =* and BHS = t & Go.x = 0 & Go.y = 0 & Go = submit of course, all these cost more than $ 500. I know all about "lens lust" in the face of budgetary constraints, so do not tell them not to achieve the goal of eBay … just be prepared for disappointing results.
Nikon D40 – Macro by Ovidiu Popa – HD