As is the norm for this class of cameras, the A2100 IS shines at ISO sensitivities below ISO 200. Though there is some graininess/noise at all ISOs, it becomes readily noticeable at ISO 400, but for the most part detail remains good. Actually, you can get up to ISO 800 and still have a usable photo at smaller sizes, as long as you're OK with the reduced detail and clarity.
Taken at ISO 160 using the camera's Smart Auto feature. It's a little softer off-center, but detail is good and the extra resolution comes in handy for cropping in to see the pollen collected on this insect's abdomen.