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Interesting stuff Roger,
Although i'm not answering your question in anyway i thought i'd add the following. I've played around alot with iso settings on the 600d (i've got one too) and always paid close attention to what results others have got with the same camera and to me from a purely subjective view it looks like either iso 400 or iso 800 is the go for this camera. iso 1600 is stretching it a bit far, but I'd be keen to see some scientific data to back it up.
cheers
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