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<blockquote data-quote="WayneF" data-source="post: 308583" data-attributes="member: 12496">Turn Auto ISO off then.&nbsp; The camera will still work.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />There is no one answer - Nikon has implemented Auto ISO with flash three ways.Older iTTL models (D300 and earlier) -&nbsp; Auto ISO stayed at Minimum ISO if flash was being used, because, well, we were using flash instead.&nbsp;&nbsp; For a hot shoe TTL flash, ISO would increase only if the flash had insufficient power to do it otherwise.Next versions (D300S and later) - started doing what you said - Auto ISO is always adjusted for the dim ambient, regardless if flash or not.&nbsp; The flash always has work into high ISO.&nbsp; &nbsp; High ISO makes TTL BL be fill flash instead of direct flash, and the room incandescent is orange.&nbsp; But we can always turn Auto ISO off. The few very latest versions, D800, D600, and I think D7100 (but not D7000)&nbsp; -&nbsp; it got better again.&nbsp; &nbsp; If flash is being used, Auto ISO with flash will increase only two stops, like to ISO 400, and will not go higher if flash is being used.&nbsp;&nbsp; This is about right for bounce flash.For a Manual mode flash,&nbsp; Auto ISO should stay at minimum in all cases.&nbsp; We cannot set a Manual flash if ISO is bouncing around.</blockquote>

[QUOTE="WayneF, post: 308583, member: 12496"] Turn Auto ISO off then. The camera will still work. :) There is no one answer - Nikon has implemented Auto ISO with flash three ways. Older iTTL models (D300 and earlier) - Auto ISO stayed at Minimum ISO if flash was being used, because, well, we were using flash instead. For a hot shoe TTL flash, ISO would increase only if the flash had insufficient power to do it otherwise. Next versions (D300S and later) - started doing what you said - Auto ISO is always adjusted for the dim ambient, regardless if flash or not. The flash always has work into high ISO. High ISO makes TTL BL be fill flash instead of direct flash, and the room incandescent is orange. But we can always turn Auto ISO off. The few very latest versions, D800, D600, and I think D7100 (but not D7000) - it got better again. If flash is being used, Auto ISO with flash will increase only two stops, like to ISO 400, and will not go higher if flash is being used. This is about right for bounce flash. For a Manual mode flash, Auto ISO should stay at minimum in all cases. We cannot set a Manual flash if ISO is bouncing around. [/QUOTE]

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