What Camera?

I have no personal experience with that camera, but research indicates that it's average at best. Too many compromises have been made to achieve such a small package.

Were it me, standing in Walmart looking at cameras, I'd probably buy an SX130IS. It has manual controls the 100HS lacks (important when forcing a point-and-shoot out of its' comfort range to image coins), a much longer zoom, and is $20 cheaper. The 100HS has a slight advantage in low light (irrelevant to coins), and 1080 video rather than the SX130's 720. I have a friend who owns an SX130, and she managed some surprisingly good images from an indoor concert with it.

There are people on this forum achieving excellent results with all manner of small cameras. It's about your ability to learn your camera and maximize its' capabilities, rather than any one camera standing out as "better" than the others. The only specific feature I'd strongly advise is the ability to manually change ISO, exposure and aperture.

On the viewscreen of a camera, possibly. What would it look like on my 26" monitor? Not everybody here is an accomplished coin photographer, yet. I'm working on it.

One way or another, nice images of coins are going to require work. And time. Go through my Gallery; you won't see a single image in there into which I have less than 15-20 minutes of concentrated work. It'll get easier for you with practice, but cropping is quite possibly the most important skill you'll need to develop.

I use an elph and it works great. Mines older though, sd1000. The macro setting works well.

This is shot on a desktop tripod, no flash, manual mode, macro setting, iso 100:



Here's another shot with the same cam/settings



No special lighting was used in either of these.