bral
photographing under glass, some pointers.
you will be troubled by reflections on the glass.
you need two lights to illuminate the drawing under the glass.
these lights should be placed opposite each other at 45 degrees to the camera to drawing axis. this way the reflections of the lights themselves are never seen by the camera.
you need the area around and behind the camera to be totally dark.
this is probably a job best done in a darkened room at night.
the setup I have described is basically the geometry of a lithographic camera like this agfa gevaert repromaster. a superb camera in its day btw.
