> >> If the painting is covered with glass AND you are allowed anywhere near > >> the glass ... get an assistant to hold a piece of mirror against the glass > >> in the centre of the picture. > > that is a good idea, but still it does not guarantees the painting and the film corners are in line... Then use a zoom lens! Zoom out far enough to align the edges of the frame (by rotation) with the viewfinder then zoom in to cover just the part of the picture you want. Or am I missing something ;o) Bob