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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: 557418" data-attributes="member: 12496"><p>I don't think it is about "high ISO" as such, or wide aperture or slow shutter speed. Instead it is about fully exposed ambient, vs a less significant amount. These factors like high ISO just tend to fully expose the ambient. Which affects TTL BL automation for balancing flash, and also white balance of course.</p><p></p><p>I'm not aware of a difference in ambient two stops down vs at a zero black level. Neither should interact much with flash, and I suspect very little difference in flash compensation response. I think the main thing is an ambient level that is not significant towards the exposure is good (normal places flash would be used). If ambient is significantly important to exposure, TTL BL will have the goal to attempt to reduce the flash level, to not overexpose the total. It has its own mind. Which is generally good if the user stands back and leaves it alone. Just not very controllable, automation does not mix well with user control.</p><p></p><p>There are a couple of effects in the TTL BL flash system where Nikon has made it difficult for users to affect what the automation is doing, or to turn off the automation. TTL flash mode is superior in that way, in that it does the expected, but Nikon has made that be unnecessarily difficult to do now. Novices may like TTL BL automation, but pros, less so. The camera itself seriously needs a TTL vs TTL BL metering menu for our selection. Why not?</p></blockquote><p></p>
[QUOTE="WayneF, post: 557418, member: 12496"] I don't think it is about "high ISO" as such, or wide aperture or slow shutter speed. Instead it is about fully exposed ambient, vs a less significant amount. These factors like high ISO just tend to fully expose the ambient. Which affects TTL BL automation for balancing flash, and also white balance of course. I'm not aware of a difference in ambient two stops down vs at a zero black level. Neither should interact much with flash, and I suspect very little difference in flash compensation response. I think the main thing is an ambient level that is not significant towards the exposure is good (normal places flash would be used). If ambient is significantly important to exposure, TTL BL will have the goal to attempt to reduce the flash level, to not overexpose the total. It has its own mind. Which is generally good if the user stands back and leaves it alone. Just not very controllable, automation does not mix well with user control. There are a couple of effects in the TTL BL flash system where Nikon has made it difficult for users to affect what the automation is doing, or to turn off the automation. TTL flash mode is superior in that way, in that it does the expected, but Nikon has made that be unnecessarily difficult to do now. Novices may like TTL BL automation, but pros, less so. The camera itself seriously needs a TTL vs TTL BL metering menu for our selection. Why not? [/QUOTE]
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Nikon DSLR Cameras
D750
how your auto iso and flash works ?
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