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<blockquote data-quote="WayneF" data-source="post: 451060" data-attributes="member: 12496">A few details though...&nbsp; Only on the most recent few camera modes models (D800 and later), the camera LIMITS Auto ISO to two stops increase (4x, typically from ISO 100 to ISO 400) if the flash is present, but only for external hot shoe flashes.&nbsp; The internal flash does not limit ISO that way (it is small and ISO can help it).Auto ISO will not increase at all if the ambient is bright enough to not need it.&nbsp; Auto ISO is purely about the ambient.&nbsp; Reach up and turn the flash off (shut the internal door), and Auto ISO value will not be affected (except for hot shoe flashes, when this two stop limit is removed).The many models from D300S until D800 did not limit Auto ISO. Then any time we are in dim ambient, Auto ISO goes sky high, and the flash has to use whatever ISO it discovers is in effect.&nbsp; The problem with that is when indoors, now high ISO sees the ambient well, but incandescent ambient is very orange.&nbsp; We need CTO filters on the flash to make it orange too, so we can use incandescent white balance.&nbsp; Few bother however.&nbsp; If using flash, it is better to keep ISO low, to keep out the orange ambient.</blockquote>

[QUOTE="WayneF, post: 451060, member: 12496"] A few details though... Only on the most recent few camera modes models (D800 and later), the camera LIMITS Auto ISO to two stops increase (4x, typically from ISO 100 to ISO 400) if the flash is present, but only for external hot shoe flashes. The internal flash does not limit ISO that way (it is small and ISO can help it). Auto ISO will not increase at all if the ambient is bright enough to not need it. Auto ISO is purely about the ambient. Reach up and turn the flash off (shut the internal door), and Auto ISO value will not be affected (except for hot shoe flashes, when this two stop limit is removed). The many models from D300S until D800 did not limit Auto ISO. Then any time we are in dim ambient, Auto ISO goes sky high, and the flash has to use whatever ISO it discovers is in effect. The problem with that is when indoors, now high ISO sees the ambient well, but incandescent ambient is very orange. We need CTO filters on the flash to make it orange too, so we can use incandescent white balance. Few bother however. If using flash, it is better to keep ISO low, to keep out the orange ambient. [/QUOTE]

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