Well I decided to take a photo of a Ft. McHenry quarter that I found in my pocket change. Now this was taken with my iPhone using the macro adapter , Led lighting provided by a flashlight and lantern. My electric was off from early AM Wednesday till 9PM Friday. My Comcast from Wednesday till Monday appox. 1300 hrs. (Comcast internet, phone & TV)
VERY CREATIVE!!!!! If you guys look closely you'll see that he is using those black Binder/Paper clip as a stand for the coin.
I would think one could search half dollar, quarter, and dime rolls, picking out the silver by the pitch.
I've experimented with taking coins pictures with just about every kind of light you can think of, even by candlelight.
Starlight,might be a little difficult, but I could see being able to do it by moonlight. But you might be only able to do it during full moons.
If you locked open the camera shutter for most of the night, you could possibly do it. Besides, taking pictures during the day via the Sun, is by starlight.
Now here is the coin after I cropped it using PhotoScape, notice the paper clip is gone. Then I coverted to black & white
At 10,000 feet or more, on a clear night, the Milky Way puts out a lot more light than most would think. And I've spent many a night under those circumstances. Never tried to take a coin pic though