: Something to add.. if you do this PVC thing, you'll need two sizes - since the two sets of lenses are so different in size. The a reducer or two between them to connect the two. Take them with you to the locval plumbing supply store and tell them what you're up to. They'll usually let you stand there and assemble stuff (dry) until you figure out what's required... Interesting project!whatever why don't you buy one and say you maid it it is 10 times easyer.