Hi CK,
Here are more tips:
1 - Don't use incandescent bulbs.
2 - Use CFL bulbs or Halogen bulbs that give off white light (high lumens), not the ones that give off yellow light (low lumens).
3 - You should have the equivalent of about 200-300 watts of light. That's what I use.
4 - Turn off the iPhone's zoom feature. Use the macro setting, not the micro setting.
5 - Hold the iPhone about 3-4 inches from the coin.
6 - A grey background works best. I use a grey towel. I put a crease/ridge in it, which elevates the coin about 1 or 1 1/2 inches above the rest of the towel.
7 - Experiment with different coin angles and iPhone angles. If I hold my iPhone exactly parallel to the plane of the coin, the photos come out blurry. I usually tilt my iPhone about 5-10 degrees along both the X-axis and Y-axis (relative to the plane of the coin).
8 - Shoot about 10-20 photos of each
side. Use the best one.
Meepzorp