Yeah i've been doing that by taking the macro correction lens off, but if you zoom in, you clear out the corners but almost loose the fish effect, plus it blurs a bit. That said - just found this....
Raynox DCR-CF185PRO 185-DEGREE Circular Fisheye Conversion Lens For Canon PowerShot
http://www.nextag.com …0a1c0538-779AFD9F8B90AA9F
| HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO |
'' Available Since: Jan 15, 2008 '' so - yeah - BRAND NEW STUFF TO PLAY WITH!!
The blurb says:
A fabulous 185-degree Circular Fisheye conversion lens was introduced from Raynox, called DCR-CF185PRO. Once again, Raynox filled the need of advanced image creators. Upon mounting on the zoom lens, it opens the field of view to the ultra wide angle, the diagonal fisheye angle and to the circular fisheye images. A very interesting feature of this particular lens makes it possible to change the scenery from an ultra wide angle view to a diagonal fisheye and to the circular fisheye or?the other way, by zooming the lens. An adapter ring RA6258 for 58mm filter size and a RA6252 for 52mm filter size are included with DCR-CF185PRO Fish-Eye lens.
Love the ASIN code on Amazon.co.uk .... ''B000B5'' - W00T !!! - and thanks for the heads up info Tareq.
(EDIT)
Hmm .... google image search found this ...
http://www.sibiul.ro/poza_zilei/pic2006-08-04.jpg
Still got corners on 
Eeesh, bigger than it looks too...
http://mini2.jp/archives/050915_02.jpg
LOL ... http://aggregate.org/DIT/peepfish/
< - - - funny stuff with door peephole lenses and glue