I want a fisheye lens, but I don't want to spend 500$ on a real fisheye unit. What to do?
I saw this cool post: http://photojojo.com/content/diy/make-your-own-fisheye-lens/
And decided that I could do one better: I would go to an eyeglasses shop and get the highest prescription lens-blank they had.
A digital camera (SLR or point-and-shoot)
If it's an SLR, you also need an 18-55 lens, stock with most cameras.
Very thick, uncut eyeglass-lens. ($15)
Step 1: Buying the lens
Buy a blank, uncut lens from an optician.they come in either +sizes, which are convex and will do the opposite, and -size concave lenses, which make the magic happen. I am using a -8.00 hi-index lens. Don't buy the compressed plastic kind either, you want super-size coke bottles