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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: 557263" data-attributes="member: 12496"><p>Matrix metering mode watches the full frame, but it does give added importance to the focusing point for ambient. And of course, Spot metering is at the focus point, for ambient.</p><p></p><p>Matrix, Center Weighted, or Spot metering methods are about the ambient.</p><p></p><p>Flash instead always meters in a central area (a little smaller area than Center Weighted metering). A different metering system. </p><p>TTL BL mode does try to balance the flash level with the ambient, if the ambient is significant. </p><p>TTL flash mode ignores any ambient, and comes ahead on strong regardless of ambient.</p><p></p><p></p><p></p><p>TTL BL is an automation system that tries to determine flash compensation for itself. You might fight it, but it's a good bet it will win. In bright fully exposed ambient needing balancing, then your added efforts are like two cooks salting the soup, unknown to each other -but the system can ignore your efforts in some cases, to achieve its own goal. You however need TTL flash mode to be able to ignore the systems efforts. TTL BL would not be described as user control. However, if the ambient level is left underexposed a couple of stops, then nothing for the system to balance, and then TTL BL and compensation works more like TTL mode. This is my experience and notions. A little experimentation bears it out.</p><p> </p><p> TTL mode instead comes ahead on strong, always planning to honor its metered flash goal, regardless of presence of any ambient. So in a fully metered ambient, then that is full ambient exposure plus full flash exposure, which at the subject is 2x exposure, or one stop over exposed, needing manual flash compensation of course. -2 EV FC is typically good, like one flash in bright sun. TTL BL does that automatically, at your 0 EV FC level. </p><p> This is with respect to ambient, it is not about two flashes in a portrait situation. In such portrait situation, ambient is intentionally kept insignificant, and then normal lighting ratio of two lights makes sense. But if you also have fully exposed ambient and TTL BL automation messing with flash level, then bets are off.</p><p></p><p>It is just becoming more difficult to switch out TTL BL, to choose TTL mode.</p><p></p><p></p><p></p><p>That will work fine and as expected, indoors, if the ambient is ignored, and left at low level and insignificant to the overall exposure.</p><p></p><p>But if you use high ISO and wide aperture and slow shutter to also fully expose the ambient, then TTL BL flash compensation automation becomes a factor, with its own goals and actions. Also other problems like mixed lighting ruining white balance.</p></blockquote><p></p>
[QUOTE="WayneF, post: 557263, member: 12496"] Matrix metering mode watches the full frame, but it does give added importance to the focusing point for ambient. And of course, Spot metering is at the focus point, for ambient. Matrix, Center Weighted, or Spot metering methods are about the ambient. Flash instead always meters in a central area (a little smaller area than Center Weighted metering). A different metering system. TTL BL mode does try to balance the flash level with the ambient, if the ambient is significant. TTL flash mode ignores any ambient, and comes ahead on strong regardless of ambient. TTL BL is an automation system that tries to determine flash compensation for itself. You might fight it, but it's a good bet it will win. In bright fully exposed ambient needing balancing, then your added efforts are like two cooks salting the soup, unknown to each other -but the system can ignore your efforts in some cases, to achieve its own goal. You however need TTL flash mode to be able to ignore the systems efforts. TTL BL would not be described as user control. However, if the ambient level is left underexposed a couple of stops, then nothing for the system to balance, and then TTL BL and compensation works more like TTL mode. This is my experience and notions. A little experimentation bears it out. TTL mode instead comes ahead on strong, always planning to honor its metered flash goal, regardless of presence of any ambient. So in a fully metered ambient, then that is full ambient exposure plus full flash exposure, which at the subject is 2x exposure, or one stop over exposed, needing manual flash compensation of course. -2 EV FC is typically good, like one flash in bright sun. TTL BL does that automatically, at your 0 EV FC level. This is with respect to ambient, it is not about two flashes in a portrait situation. In such portrait situation, ambient is intentionally kept insignificant, and then normal lighting ratio of two lights makes sense. But if you also have fully exposed ambient and TTL BL automation messing with flash level, then bets are off. It is just becoming more difficult to switch out TTL BL, to choose TTL mode. That will work fine and as expected, indoors, if the ambient is ignored, and left at low level and insignificant to the overall exposure. But if you use high ISO and wide aperture and slow shutter to also fully expose the ambient, then TTL BL flash compensation automation becomes a factor, with its own goals and actions. Also other problems like mixed lighting ruining white balance. [/QUOTE]
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D750
how your auto iso and flash works ?
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