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<blockquote data-quote="WayneF" data-source="post: 494853" data-attributes="member: 12496">Nikon DSLR have three times drastically changed the way Auto ISO works with flash.At first, the DSLR models up through the D300 would never increase Auto ISO with flash, because, well, because we were using flash instead.&nbsp; Actually, it could increase ISO, but only when and if it was determined that the flash did not have enough power to do it otherwise.This way seemed pretty great to me, and is apparently what you expected too.Then the next many models (D300S until the last 4 or 5 models recently), started setting Auto ISO for the ambient reading, regardless if flash was used or not.&nbsp; That's pretty poor. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; Flash indoors always sees a very high ISO.&nbsp; If we are going to properly expose ambient with ISO, and use flash for fill, then the flash needs color filters to match the ambient white balance.Then the last very few models (D800 on), which should include your D750, now will only increase Auto ISO by two stops if an external flash is used (hot shoe flash).&nbsp;&nbsp; That typically means from ISO 100 to ISO 400, but 2 stops maximum regardless (4x)... for a hot shoe flash. This is a pretty good plan for bounce flash.&nbsp; Except, the internal flash is an exception, and it still gets full ISO increase.&nbsp; I suppose because it is a tiny flash and needs the ISO.You can turn Auto ISO off.&nbsp; That is the best plan.This is all speaking of TTL flash.&nbsp; If Manual flash mode, the ISO is NEVER increased on any model in any case.&nbsp; Manual flash cannot respond to ISO changes.</blockquote>

[QUOTE="WayneF, post: 494853, member: 12496"] Nikon DSLR have three times drastically changed the way Auto ISO works with flash. At first, the DSLR models up through the D300 would never increase Auto ISO with flash, because, well, because we were using flash instead. Actually, it could increase ISO, but only when and if it was determined that the flash did not have enough power to do it otherwise. This way seemed pretty great to me, and is apparently what you expected too. Then the next many models (D300S until the last 4 or 5 models recently), started setting Auto ISO for the ambient reading, regardless if flash was used or not. That's pretty poor. :) Flash indoors always sees a very high ISO. If we are going to properly expose ambient with ISO, and use flash for fill, then the flash needs color filters to match the ambient white balance. Then the last very few models (D800 on), which should include your D750, now will only increase Auto ISO by two stops if an external flash is used (hot shoe flash). That typically means from ISO 100 to ISO 400, but 2 stops maximum regardless (4x)... for a hot shoe flash. This is a pretty good plan for bounce flash. Except, the internal flash is an exception, and it still gets full ISO increase. I suppose because it is a tiny flash and needs the ISO. You can turn Auto ISO off. That is the best plan. This is all speaking of TTL flash. If Manual flash mode, the ISO is NEVER increased on any model in any case. Manual flash cannot respond to ISO changes. [/QUOTE]

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