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Message: <blockquote data-quote="J-see" data-source="post: 493084" data-attributes="member: 31330">I'm not 100% sure but I think the Hi and Lo ISO are the photon/electron count afterwards multiplied by a specific value for that ISO setting. In essence it doesn't make too much difference since all other ISO settings except the native one are also but a certain value applied to the photon count.To be sure you'd have to check the dynamic range values of the cam; as long as they in/decrease it is "real" ISO. If 12800 and 25k have the same DR stops, it is the first value adjusted towards the second. The electron count for both would be identical but they're factored differently.</blockquote>