Hi, I was just looking at my recently taken pictures where I chose ISO 800 on my D300s. All pictures are quite sharp but parts of pictures just look somehow muddy. Is this noise? Besides taking pictures at lower IS0 can I make anything about it? Is this just the limit of an old D300s and the camera can't do it better? All samples are not sharpened nor manipulated. Any help would be much appreciated. Regards, Miha.