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<blockquote data-quote="WayneF" data-source="post: 634731" data-attributes="member: 12496">That is normal for the relatively newer models of Nikon DSLR.&nbsp; Nikon has changed the way Auto ISO works with TTL flash three times over the last ten years.Auto ISO is NEVER enabled if a manual flash is detected present.&nbsp; Manual flash cannot respond to ISO changes. Auto ISO will be set to minimum ISO then.In the beginning of CLS (D70 ten years ago), presence of a TTL flash also disabled Auto ISO too.&nbsp; Auto ISO was always at minimum ISO if a flash was detected. They had it right, and that's my preference, I'm sorry they changed it.Then when the D300S (2009) was offered, this stopped.&nbsp; ISO would stay at the very high&nbsp; value metered for ambient, regardless if TTL flash was present or not.&nbsp; That is NOT the best way to use flash.And Nikon apparently regretted it too, and starting with around the D7000 (2010), they corrected that. Now Auto ISO with a TTL flash will go at most two stops above minimum, which is ISO 400 if from ISO 100 minimum).&nbsp; This two stops is often necessary and desirable for bounce flash, which often needs ISO 400.More at <a href="http://www.scantips.com/lights/flashbasics4e.html" target="_blank">Auto ISO and Nikon Flash</a>If you want a higher ISO you can turn off Auto ISO and set it higher, but that's not a good plan for flash in general.&nbsp; Because this high ISO boosts the incandescent ambient high and visible, and it is orange. The flash is white.&nbsp; The only way to correct that bad white balance imbalance is to set Incandescent WB, and then put CTO orange filters on the flash. &nbsp;Or better, just turn Auto ISO off with flash.</blockquote>

[QUOTE="WayneF, post: 634731, member: 12496"] That is normal for the relatively newer models of Nikon DSLR. Nikon has changed the way Auto ISO works with TTL flash three times over the last ten years. Auto ISO is NEVER enabled if a manual flash is detected present. Manual flash cannot respond to ISO changes. Auto ISO will be set to minimum ISO then. In the beginning of CLS (D70 ten years ago), presence of a TTL flash also disabled Auto ISO too. Auto ISO was always at minimum ISO if a flash was detected. They had it right, and that's my preference, I'm sorry they changed it. Then when the D300S (2009) was offered, this stopped. ISO would stay at the very high value metered for ambient, regardless if TTL flash was present or not. That is NOT the best way to use flash. And Nikon apparently regretted it too, and starting with around the D7000 (2010), they corrected that. Now Auto ISO with a TTL flash will go at most two stops above minimum, which is ISO 400 if from ISO 100 minimum). This two stops is often necessary and desirable for bounce flash, which often needs ISO 400. More at [URL="http://www.scantips.com/lights/flashbasics4e.html"]Auto ISO and Nikon Flash[/URL] If you want a higher ISO you can turn off Auto ISO and set it higher, but that's not a good plan for flash in general. Because this high ISO boosts the incandescent ambient high and visible, and it is orange. The flash is white. The only way to correct that bad white balance imbalance is to set Incandescent WB, and then put CTO orange filters on the flash. Or better, just turn Auto ISO off with flash. [/QUOTE]

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