Ally pinhole made from a pie dish. I might try a more advanced design using a body cap and thinner foil. This one at about 48mm from the sensor plane, is a short telephoto pinhole, with a field of view of approx 77mm in 35mm terms. The recessed mirror in the 300D should also allow for a wider angle pinhole - about 36mm should be possible, which should give a field of view slightly narrower than a standard lens.