Originally posted by adamaitken Spot on about the limits of ISO 1600. But were you using RAW or jpg? It is a bit easier to adjust an underexposed RAW file as a jpg file has less info in the shadows that can be recovered. ( I think). If you underexpose on RAW or jpg, it is difficult to bring the shadows up without creating lots of noise. I wonder if it is better to overexpose slightly and later recover the highlights?
I use RAW entirely (unless I am at the end of a vacation and running out of card space). The K7 IMO is definitely a camera that you have to shoot and expose to the right, if at all possible. Still don't want to clip the highlights though, if you want to keep them.
I agree with you on the jpeg comment. At high iso, underexposure with a jpeg is killer. With RAW, there is a little bit of head room. I have brought iso 1600 files up a stop, but there is an awful lot of noise in the shadows with those photos. Helps to have noiseware or topaz denoise on hand for those situations.
The thing that people forget with noise is that viewable size/print size are the important things. If you are just viewing a photo on a computer monitor or, printing at 4 by 6, your pixel level noise will vanish, even without noise reduction.