#1. "RE: flash photography in museums" In response to Reply # 0
Several reasons come to mind. It can indeed damage paintings and other old objects (like Greek painted pottery). The light from a flash contains an amount of IR and UV wavelengths. Those slowly change the pigments in paint (which is why the paint on your house slowly fades over time). The lights in museums are specially designed to minimise or eliminate those wavelengths.
Also, dozens of people popping flashes in a museum is not nice to the other visitors so for the comfort and enjoyment of those banning flashes is also a good PR move.
any size is fullframe for a given definition of frame