Hi I'd like to ask a few questions about fisheye lenzes. I am looking for one of these 180 degree fisheye lenzes but I don't know where to start. the first thing that I want to know is that if fisheye lenzes only work with a specific type of camera or we can attach them to any kind. to be more specific I want a fisheye lenz for a HP Photosmart 945 digital camera. Can anybody give me some information about them and if I can attach one to my camera.