On both of the "no photography" tours I've been on (Keys to the Kingdom and Backstage Magic), the guides allowed us to keep our cameras as long as we didn't take any backstage pictures. As a matter of fact, they told us there would be a few locations (when we were onstage) that we might want to take photos. This, like everything else on a tour, varies by the guide you have. Most are quite nice and will take you at your word that you won't take any backstage pictures. BTW -- If nothing else, you'll want to make sure you have your camera with you when you arrive for the Keys tour. If you booked the early one, you'll be rewarded with an almost-empty Main Street USA to photograph.