Somewhere in my reading Ansel Adams claimed to have changed film inside his sleeping bag during his early (1920s) days in the Sierras. Thinking about it, I can't imagine a better way to get dust and hairs onto the film holders, especially with the cotton sleeping bags of the time. The movie industry must have created portable darkrooms for loading movie cameras by then and I bet some people had changing bags if not crude versions of Harrison Tents but what do you think? Was Ansel bloviating or was he a really superb negative retoucher?