amfoto1 wrote:
Under-exposure leads to noise when you have to boost exposure in post-processing. To minimize noise, you're usually better off slightly over-exposing and "pulling" image exposure back down a little (1/3 to 1/2 stop, max).
So that is why my pictures are noisy when I magnify them! That is a great piece of advice. So then my camera is right when it says my image is under-exposed. I would always set it to where it says my images are a little under-exposed and my pictures are always a little noisy.