Know Nikon also have compressed Raw format in the D2X (I don't know about other models). I've been in a Nikon workshop latly and they say there's no difference between the compressed and the uncompressed, at least optically. They confessed that some times, few, a minor degree of degradation may occur, but of no optical difference, meaning that you could'nt see differences even in large prints. But they did not find any pattern in the image loss, and they can not say why or when it will occur.
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