"I made a pinhole 0.3 mm in diameter in a small sheet of aluminum, mounted into a T Mount adapter ring for a Pentax SLR camera body. A 36 mm open tube extension brought the focal length to 84 mm yielding an f/stop of f/280. The auxiliary finder was added at top of camera body to better aim since camera reflex finder shows near total darkness. ASA of camera was set to 3200. Indoor images were between 5 to 12 seconds."