<< <i>When this technique was first mentioned, I tried it. I found it to be awkward, and every time you go to shoot an image you need to be sure the glass is absolutely clean with no specks or streaks. There are other ways to accomplish diffusing the lighting without this much trouble. Here is a coin in a slab, with nothing between the lense and the coin. >>
After lots of experimenting with coin photos, I've settled on a black background for raw coins. No reflections, no "fooling" the light meter or color balance, etc. I use a piece of conductive black foam, used to hold IC chips, which I happened to have laying around.
I use regular 75W incandescent bulbs (not Reveal or Ott) and usually use one lamp, occasionally two. Though I don't have a lot of experience with Proofs, I find diffuse lighting works best - either outdoors in the shade, or putting a white sheet of paper across the opening of the lamp (don't this this for long - something will burn!)
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<< <i>When this technique was first mentioned, I tried it. I found it to be awkward, and every time you go to shoot an image you need to be sure the glass is absolutely clean with no specks or streaks. There are other ways to accomplish diffusing the lighting without this much trouble. Here is a coin in a slab, with nothing between the lense and the coin. >>
So what technique did you use for that pic, Eric?
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I use regular 75W incandescent bulbs (not Reveal or Ott) and usually use one lamp, occasionally two. Though I don't have a lot of experience with Proofs, I find diffuse lighting works best - either outdoors in the shade, or putting a white sheet of paper across the opening of the lamp (don't this this for long - something will burn!)
(typos edited)