As a lark, I got a Finney pinhole body cap. This is a Canon body cap which has a .259mm laser drilled pinhole on it. It produces an interesting dreamy out-of-focus image. The pinhole itself acts as a lens--in this case 45mm f/185



They are $29.99 from Calumet Photo http://www.calumetphoto.com/ctl?PAGE=Controller&ac.ui.pn=cat.CatItemDetail&ac.item.itemNo=PY2120&ac.cat.CatTreeSearch.detail=y&type=SPDSEARCH