Here's a guy who did a set up to photograph snowflakes. And gets a great product from it. I should think this type of setup could be adapted for photographing coins, and get better pics of them than I've seen in a long time.... http://www.demilked.com/macro-snowflakes-diy-camera-alexey-kljatov/ http://chaoticmind75.blogspot.ru/2013/08/my-technique-for-snowflakes-shooting.html
Actually, I would decrease the aperture...necessitating an increase in exposure time...but I could be wrong.
Oops, it was another article I was reading on-line, not this one, my bad. I'll see if I can find it again.
Ah, I was correct, he states it in his blog post that he adds artificial color. http://chaoticmind75.blogspot.ru/2013/08/my-technique-for-snowflakes-shooting.html In another article I read from another snoflake photog, he says the he tries to shoot them at an angle to bring out the prismatic color.
He's using a standard macro technique called "lens stacking". Not sure why he chose to use a Helios lens, maybe he had it laying around. Quality would be better using an enlarging lens or microscope objective, though his images are pretty stunning.
Well, they did say the lens was $50, which is definitely not cheap. You can get an enlarging lens cheaper than that (I'd recommend a Nikon 50mm f/2.8 EL-Nikkor). A microscope objective is even cheaper, but the adapter to mount it costs more than the objective, though together they cost less than $50. However, the 50mm Nikon will give you great performance at these magnifications. If interested, here's an example: http://www.ebay.com/itm/Nikon-El-Ni...891?pt=LH_DefaultDomain_0&hash=item2c766f6903
I like Nikon and have my eye on some nice DSLR's and lenses. Now I's just got's to come up with the scratch.....