Kim has hacked his dusty holga camera and turn it into a Canon EF lens for his Canon 20D. What you need is EOS body cap, EOS lens cap, Holga lens, Empty 35mm film canister, Scissors, xacto knife and some super glue, Electric drill with 1 in. hole bit, and a 3/16 in. drill bit, Dremmel with sanding attachment.
“The process was really simple and it took me about three hours to finish the project from thinking up how to do it to finally getting the vignetting right. The good thing about this experimental home made lens is that I can focus from 5 inches away to infinity.”
Check out some sample photos taken with this lens here