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Nikon DSLR Cameras
D750
how your auto iso and flash works ?
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<blockquote data-quote="WayneF" data-source="post: 556822" data-attributes="member: 12496"><p>Nikon iTTL DSR have had three versions of how Auto ISO works with flash.</p><p></p><p>Early models (D70 up through the D300) never increased Auto ISO above Minimum with flash, it always remained at Minimum ISO with flash (one exception, if a hot shoe flash had insufficient power for the situation, then it would increase ISO for it, but otherwise, Auto ISO never increased with flash. This was sensible, and the best plan, but they abandoned it.</p><p></p><p>Middle age models, D300S on, would ALWAYS increase Auto ISO for the ambient reading, regardless if flash was present or not. This means indoor flash is always working into high ISO if Auto ISO is on. But if using flash, we don't need or want high ISO. This is when they started adding the filter holders to try to match the ambient light. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Frankly, this was the pits with flash, but Auto ISO can be turned off.</p><p></p><p>Then recent models recovered from this, certainly since the D800, and possibly a couple of models earlier) started limiting Auto ISO with flash increase to two stops above Minimum ISO (4x above Minimum), but only for hot shoe flashes. The Commander still never increases Auto ISO, but the internal flash used alone still fully increases Auto ISO based on the ambient (ISO will of course remain low in sunshine outdoors). But at least it became unnecessary to turn Auto ISO off for flash, as two stops was usually workable, and was generally good for bounce flash.</p><p></p><p>Nikon does not spec or discuss that, but it always depends on which camera we are discussing. <img src="http://nikonites.com/images/smilies/smile.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And of course, Auto ISO can never increase with a manual flash in any camera model, because manual flash cannot respond to Auto ISO. The manual flash brand does have to be recognized (CLS capable) for Auto ISO not to increase.</p><p></p><p></p><p></p><p></p><p>My notion is that 1/320 is where the surprises occur. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>If in camera A mode, and outdoors with fill flash, we do have to know we must stop down to up near f/11 so the maximum sync shutter speed can work. Otherwise, it just flashes a LO error at us.</p><p></p><p>P mode is good for fill flash outdoors, it knows to stop down to around this f/11 (to allow maximum sync shutter speed to work in sunshine).</p><p></p><p>Yes, Auto FP mode will allow fast shutter speed there, but at very reduced flash power (about 20% maximum).</p><p></p><p>That can work, at least for fill flash if not too far, but the problem is that if our actual shutter speed is near this 1/320 limit, then it can vary with lighting, and one shot might be below it and next shot above it. Then it is switching in and out between speedlight mode and FP mode, and the flash power varies greatly, and our results probably vary greatly, if we are not aware of what's happening.</p></blockquote><p></p>
[QUOTE="WayneF, post: 556822, member: 12496"] Nikon iTTL DSR have had three versions of how Auto ISO works with flash. Early models (D70 up through the D300) never increased Auto ISO above Minimum with flash, it always remained at Minimum ISO with flash (one exception, if a hot shoe flash had insufficient power for the situation, then it would increase ISO for it, but otherwise, Auto ISO never increased with flash. This was sensible, and the best plan, but they abandoned it. Middle age models, D300S on, would ALWAYS increase Auto ISO for the ambient reading, regardless if flash was present or not. This means indoor flash is always working into high ISO if Auto ISO is on. But if using flash, we don't need or want high ISO. This is when they started adding the filter holders to try to match the ambient light. :) Frankly, this was the pits with flash, but Auto ISO can be turned off. Then recent models recovered from this, certainly since the D800, and possibly a couple of models earlier) started limiting Auto ISO with flash increase to two stops above Minimum ISO (4x above Minimum), but only for hot shoe flashes. The Commander still never increases Auto ISO, but the internal flash used alone still fully increases Auto ISO based on the ambient (ISO will of course remain low in sunshine outdoors). But at least it became unnecessary to turn Auto ISO off for flash, as two stops was usually workable, and was generally good for bounce flash. Nikon does not spec or discuss that, but it always depends on which camera we are discussing. [IMG]http://nikonites.com/images/smilies/smile.png[/IMG] And of course, Auto ISO can never increase with a manual flash in any camera model, because manual flash cannot respond to Auto ISO. The manual flash brand does have to be recognized (CLS capable) for Auto ISO not to increase. My notion is that 1/320 is where the surprises occur. :) If in camera A mode, and outdoors with fill flash, we do have to know we must stop down to up near f/11 so the maximum sync shutter speed can work. Otherwise, it just flashes a LO error at us. P mode is good for fill flash outdoors, it knows to stop down to around this f/11 (to allow maximum sync shutter speed to work in sunshine). Yes, Auto FP mode will allow fast shutter speed there, but at very reduced flash power (about 20% maximum). That can work, at least for fill flash if not too far, but the problem is that if our actual shutter speed is near this 1/320 limit, then it can vary with lighting, and one shot might be below it and next shot above it. Then it is switching in and out between speedlight mode and FP mode, and the flash power varies greatly, and our results probably vary greatly, if we are not aware of what's happening. [/QUOTE]
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Nikon DSLR Cameras
D750
how your auto iso and flash works ?
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