I used to use Verilux goose neck lamps (true light also) but I found them too cumbersome to maneuver........
Mark Goodmans' book Numismatic Photography is a good volume to have in your numismatic library.........
I also keep the lights high and close to the camera.....
Indeed......it does diffuse the light a bit. Without the vellum I wind up getting 'hot spots' on the coin.
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