I have been reading a thread on a site dedicated to "alternative imaging devices you can't put film into". They are using the body cap for a pinhole lens. They seem to have the basics down, i.e. not using the cap itself for the pinhole, but as a carrier for the pinhole material. They seem a bit confused about what to use for the pinhole itself and the best way to actually make the pinhole, what to use etc. They found where to buy commercially manufactured ones but want to know how to do it from scratch. I hope you guys can help.