Shaggy Sheep Driver, Number one is keep a bloody good lookout! Which while you are pratting about trying to take photos with a loose camera, I doubt very much you can manage singlehanded.. I havn't got a problem with TWO pilots, one to fly the plane, the other to take the photos. But the scars on your camera case imply it wasn't secure in the cockpit. Ok, only a K13 glider, but a newbie in the front seat let his camera slide down behind the stick, which caused a nasty accident.
And of course air to air photography really requires experts. Not enthusiastic amateurs alone in the aircraft who should behave responsibly.