Additionally, the National Park Service has, at some of their facilities, prohibited cameras and videotape cameras not because of lighting, or nessecarily a concern for other visitors. Their justification goes one step further, and I think with good merit. The camera holder (video or other) often looks for the best angle, and in so doing backs/bumps into other objects, cases, people, barriers etc. causing even greater concern for curators than timed flash exposures. In crowded areas this seems to be a justifiable policy! Terry Vidal UNI Museum