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Looks like 640 and 1250 are
7 December, 2009 - 21:41 — lexa

Looks like 640 and 1250 are 'software' ISO on your camera. So 1250 is shot at 1600, than values are divided by 1.25 or so.

It also looks like you've not subtracted black value (about 1000 on your camera).

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