I got at the fleamarket a (Polaroid-made?) camera-body with fixed packfilm back similar to the type 405 cassette. It has a flipping accessory shutter, several tripod threads and a standard flashlight/accessory shoe. The front has a coupling, seemingly for a lens/shutter assembly. As I realized that the packfilm back was just screwd onto the body I bought it just to have that back to custom build some instant camera. Seeing that accessory shutter I also considered as alternative use to keep it as it is and just install a pinhole. Seemingly someone else had the same idea, as seen in this photo (the only one of this thing I found after 1/2h of searching): http://www.polamad.com/images/cam-pinhole.jpg Out of sheer curiosity: What was the original use of it?