The previous post brings up a point I've been thinking about. I shoot on 12x20 and will be travelling with it this summer (I hope). I only have a couple of ho lders, and at $400 a pop I'm not likely to be buying a lot more anytime soon. H ow are ULF users changing film in the field? I've done the "dark motel bathroom with towel under door" trick, and it works fine as long as you're in a motel an d it's night. What about while camping, or anywhere during the day? Has anyone used the Harrison film tent made for 12x20? How big is this beast and (most im portantly) how well does it work?