Quote Originally Posted by Huram
Are these cheapo screw-in fisheyes any good? Will there be loss of image quality?
There's some loss in quality - but they the image is so distorted it really doesn't matter. They're a lot of fun.

They're great when you're right in the middle of things - get in close and catch then environment (actually they are good for doing environment maps for computer graphics).

They're also good for making CD labels:

(I didn't take this, but I am in it...)