How Can I Help This Photo

Not likely. Won't change the fact that every color of light is of a different wavelength, and lenses can't always focus all wavelengths at the same spot. More light will probably make the problem worse.

I only brought your attention to it because as you get better at this (which you're doing pretty quickly), it's inevitable that you'll notice it. Others reading this thread will as well.

for what it is worth..while we put all the light on the coin we can, the coin does not respond well...many times it depends on the coin....silver or copper...many times it depends on weather you zoom in at full levels or back off some levels. and the camera you have has its own ideas...when you have manual or "P" progam funtions you have the most control of what the camera could do as Dave and Ray shown...While I used to shoot at full blown every thing I found I get better pic's with my point and shoot camera..by backing off of the full potential of what the camera thinks it can do...FOR COINS not for other shootings..
after the shot... there can be adjustments to quality of the picture.. thanks Ray..

I am not sure what you mean. The first coin is a 1928-s the last one I posted is a 1923-s