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Nikon DSLR Cameras
D600/D610
Auto-ISO and TTL flash
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<blockquote data-quote="WayneF" data-source="post: 379726" data-attributes="member: 12496"><p>I avoid Auto ISO if using flash, because, well, we are using flash instead. But, it is just one opinion.</p><p></p><p>Which flash? It must have been the internal flash? </p><p></p><p>There are three generations of Nikon Auto ISO and flash, so it is hard to explain. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p>1. D300 and all older,</p><p>2. newer cameras, in between 1 and 3.</p><p>3. and most recent very few models, D800 on. I think the D600 is in this group too.</p><p></p><p></p><p>1. Never boosted Auto ISO if flash was present, being used. ISO stayed at Minimum with flash. It might boost ISO <strong>ONLY IF</strong> the TTL flash power was otherwise insufficient. This works best, IMO.</p><p></p><p>2. Always boosted Auto ISO fully according to the ambient, regardless if flash is used or not, so flash indoors was always highest ISO.</p><p></p><p>3 Nikon reconsidered this - Newest models only boosts Auto ISO two stops (to ISO 400) for external flash, but <strong>still always boosts ISO for internal flash, like 2</strong>.</p><p></p><p>Nikon does not specify this Auto ISO behavior with flash, but a simple test picture with indoor TTL flash will show the Auto ISO it obviously used.</p><p></p><p>Using Auto ISO to boost the ambient with flash makes the orange incandescent light become visible, adds ISO noise, and converts the TTL BL flash system to be fill flash instead of main flash. If an older flash with an actual TTL vs TTL BL menu, TTL mode will overexpose it..</p><p></p><p>Internal flash is tiny, and any distance more than a few feet, might need additional ISO. Shouldn't need maximum ISO.</p><p></p><p>Try flash without Auto ISO. Maybe use up to ISO 400 for the little internal flash if needed. 400 should do 10 or 12 feet, depending on aperture.</p><p></p><p>What was the camera mode, PASM? What was shutter speed and aperture? The little internal flash power needs a wider aperture, and the shutter speed affects ambient ISO.</p><p></p><p>Overexposure normally seems less likely, because there are a few factors suggesting a little underexposure is more often expected. Direct flash might often overexpose due to the dark background, but high ISO ought to rule that out.</p><p></p><p>Of course, it could just be normal metering issues. Subjects that are mostly black or dark color will overexpose.</p></blockquote><p></p>
[QUOTE="WayneF, post: 379726, member: 12496"] I avoid Auto ISO if using flash, because, well, we are using flash instead. But, it is just one opinion. Which flash? It must have been the internal flash? There are three generations of Nikon Auto ISO and flash, so it is hard to explain. :) 1. D300 and all older, 2. newer cameras, in between 1 and 3. 3. and most recent very few models, D800 on. I think the D600 is in this group too. 1. Never boosted Auto ISO if flash was present, being used. ISO stayed at Minimum with flash. It might boost ISO [B]ONLY IF[/B] the TTL flash power was otherwise insufficient. This works best, IMO. 2. Always boosted Auto ISO fully according to the ambient, regardless if flash is used or not, so flash indoors was always highest ISO. 3 Nikon reconsidered this - Newest models only boosts Auto ISO two stops (to ISO 400) for external flash, but [B]still always boosts ISO for internal flash, like 2[/B]. Nikon does not specify this Auto ISO behavior with flash, but a simple test picture with indoor TTL flash will show the Auto ISO it obviously used. Using Auto ISO to boost the ambient with flash makes the orange incandescent light become visible, adds ISO noise, and converts the TTL BL flash system to be fill flash instead of main flash. If an older flash with an actual TTL vs TTL BL menu, TTL mode will overexpose it.. Internal flash is tiny, and any distance more than a few feet, might need additional ISO. Shouldn't need maximum ISO. Try flash without Auto ISO. Maybe use up to ISO 400 for the little internal flash if needed. 400 should do 10 or 12 feet, depending on aperture. What was the camera mode, PASM? What was shutter speed and aperture? The little internal flash power needs a wider aperture, and the shutter speed affects ambient ISO. Overexposure normally seems less likely, because there are a few factors suggesting a little underexposure is more often expected. Direct flash might often overexpose due to the dark background, but high ISO ought to rule that out. Of course, it could just be normal metering issues. Subjects that are mostly black or dark color will overexpose. [/QUOTE]
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Nikon DSLR Cameras
D600/D610
Auto-ISO and TTL flash
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