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<blockquote data-quote="WayneF" data-source="post: 155573" data-attributes="member: 12496">I understand, the SB-700, SB-400, and camera internal flash only select TTL BL mode.&nbsp; The camera does this metering, but some flashes have a menu button to choose it.&nbsp; It is unknown to me if those flashes can select anything with the TT5, I assume all communication is one way, from the camera?&nbsp; Hot shoe via radio possibly could be different, but is it?&nbsp; &nbsp; Nikon Commander for example is one way communication from Commander, and with any flash model, Commander is always TTL BL too (unless Spot metering tells the camera otherwise). The Nikon system is TTL BL.&nbsp; &nbsp; TTL or TTL BL mode is shown in the extended Exif, as a way to know for sure how it metered.But Spot metering... perhaps the cure is worse than the disease?&nbsp;&nbsp; We ALWAYS have to watch flash results anyway, to know when to use Flash Compensation, to get the result our own brain thinks is wanted. Knowing how to use Flash Compensation is the exclusive secret of TTL success.&nbsp; FC is how you control what the automation does.So speaking indoors,&nbsp; TTL BL simply just needs a bit more Flash Compensation than TTL mode does.&nbsp; You might start by simply dialing in +1 EV Flash Compensation for TTL BL mode (indoors, not outdoors in ambient).&nbsp; And simply adjust that base point as necessary for each situation. This then allows Center or Matrix metering, to consider more of the frame.This is assuming insignificant ambient indoors.&nbsp; It could be a moving target (so watch results, and standby with Flash Compensation). The automatic compensation done by TTL BL varies with ambient level, to nearly -2 EV in bright sun (this number is not visible to us).&nbsp; So two cooks, both salting the broth, better keep an eye on each other.&nbsp; The point is though, you can compensate what it does.</blockquote>

[QUOTE="WayneF, post: 155573, member: 12496"] I understand, the SB-700, SB-400, and camera internal flash only select TTL BL mode. The camera does this metering, but some flashes have a menu button to choose it. It is unknown to me if those flashes can select anything with the TT5, I assume all communication is one way, from the camera? Hot shoe via radio possibly could be different, but is it? Nikon Commander for example is one way communication from Commander, and with any flash model, Commander is always TTL BL too (unless Spot metering tells the camera otherwise). The Nikon system is TTL BL. TTL or TTL BL mode is shown in the extended Exif, as a way to know for sure how it metered. But Spot metering... perhaps the cure is worse than the disease? We ALWAYS have to watch flash results anyway, to know when to use Flash Compensation, to get the result our own brain thinks is wanted. Knowing how to use Flash Compensation is the exclusive secret of TTL success. FC is how you control what the automation does. So speaking indoors, TTL BL simply just needs a bit more Flash Compensation than TTL mode does. You might start by simply dialing in +1 EV Flash Compensation for TTL BL mode (indoors, not outdoors in ambient). And simply adjust that base point as necessary for each situation. This then allows Center or Matrix metering, to consider more of the frame. This is assuming insignificant ambient indoors. It could be a moving target (so watch results, and standby with Flash Compensation). The automatic compensation done by TTL BL varies with ambient level, to nearly -2 EV in bright sun (this number is not visible to us). So two cooks, both salting the broth, better keep an eye on each other. The point is though, you can compensate what it does. [/QUOTE]

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