I have been having a problem with a lot of noise in my pictures. When I view them at 100% there is very noticable noise and the pictures just aren't as clean as they should be. Smaller prints come out ok but if I crop and enlarge the image I'm not happy with them. I shot some the other day and they ranged from 100 ISO to 800 ISO, and there was noise in all of them. My gear is- Canon Rebel XTi, Canon 24-70 f2.8, and Canon 70-200 f2.8L, mostly shoot in M mode, and switch back a forth between auto and manual focus, hand held. I have shot nearly 2800 pictures with this set up and I'm not getting nearly as good of pictures as what I see on here. Not sure what the problem is. Is it me, wrong camera set up, defective equipment, bad CF cards (use Sandisk Extreme II) or something else? Any ideas or suggestions would be greatly appreciated.