My dear old Pentax ME Super has lost it's light meter and has been sitting on the shelf looking forlorn and lost for a couple of years. But today I came across this: http://www.pinholeresource.com/shop/shop?page=shop.browse&category_id=14 Toward the bottom there's one for Pentax K mount. I've never done pinhole photography, but it looks fun. Does anybody know how these caps work? It sure would be nice to use to start using the Super again.