Last fall, I became a tourist attraction myself, on a free day following a business trip to Las Vegas. I took my lightweight 4x5 (Toyo carbon-fiber field camera) to Valley of Fire state park to shoot red rocks. When the tour buses full of European tourists arrived after the good light, some of them took pictures of me with tripod and dark cloth. As others posted above, I allowed interested onlookers to look at the ground glass under the cloth and explained why it was inverted.