I don't mean to be a real nag when it comes to my pictures but I want to learn everything I can...here is a picture I took of the sky the other night (it was really pretty). I noticed when looking at the picture that it came out really "noisy". I used on of the preset functions ("night mode") because I hadn't learned how to do things manually yet. I also zoomed in on the sky (I turned my digital zoom off though). Is that the reason why it may have come out that way or was it something else?