So I just got my 300D a few days ago, and the ISO for all of my pictures are set to 3200. After doing some research I've learned that the 300D doesn't actually use the 3200 ISO unless the firmware is hacked, so I assume the person I got it from hacked it, right? Also, would that be the reason why all of my pictures are coming out so grainy looking? How do I change the ISO? and how do I know what ISO to shoot in? Thanks, I'm trying to learn!