I've always wanted a fisheye lens, but knowing I'd rarely use it, I didn't want to spring for a good one. When I found a few really cheap add-ons to existing lenses at Amazon, I used some of my birthday gift card bucks to get one - figuring it was worth a try. Today is the first chance I've had to try it out (it fits over 58mm lenses on my Digital Rebel XTi). Kind of fun!