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David,
One thing you might like to check on Fiona's camera, in the custom settings, is to see whether she has high ISO noise reduction enabled.
That setting makes an enormous difference. People sometimes confuse that setting with long exposure noise reduction. Two different things. In fact, you might want to check that she has long exposure noise reduction disabled, too.
I can't understand why there'd be such disparity between two same models.
H
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