What STCs are available for camera ports on the 1-series Cessnas ? Are there any or are the ports that you sometimes see all field approvals ? I have seen Cessnas with the exhaust carried down the side for aerial photography, is this STC'ed by anyone or a one-of on a 337 ? I have seen some Cessnas with ports, I have never looked into how these ports are approved. I would want to keep the plane in the normal category and useable for other purposes, so something home-hacked with the plane in experimental R&D category wouldn't work.