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New to off-camera Flash Photography
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<blockquote data-quote="WayneF" data-source="post: 237101" data-attributes="member: 12496"><p>Yeah, I fear newcomers who have only seen a SB-700 or SB-400 or internal flash (who have not seen a menu to select TTL vs TTL BL) may not get the difference.</p><p></p><p>TTL BL tries to automatically compensate the flash power lower in bright ambient light (called Balanced), like fill flash in sunlight becomes point&shoot. Same scene in TTL however, we have to compensate it manually, a couple of stops down from ambient.</p><p></p><p>Indoors (assuming ambient too dim to be much concerned with), TTL BL ought to try to stay out of the way, and become equivalent to TTL mode. But sometimes (intermediate room light intensity), it gives slightly less exposure than TTL mode. Which is no big deal, we always have to watch both, and do what we see we need to do, either way, both cases. Same procedure, just a slightly different starting point. For any iTTL flash, remember flash compensation, and do what you see you need to do to get what you want.</p><p></p><p></p><p>To trigger multiple iTTL flashes off camera, the Commander is required (if more than one iTTL flash). Only way for multiple iTTL (Commander will be TTL BL too, but commander knows it is off camera, and ignores the D-lens distance situation, it is not a problem. But hot shoe does not know.)</p><p></p><p>Otherwise (not commander), a TTL BL flash off camera with head not tilted up will still be affected by the camera thinking the D-lens distance also applies to the flash, but which is at a different distance and different situation, maybe in an umbrella, but unknown to camera, who is still thinking "D-lens distance" and hot shoe direct flash. </p><p></p><p>An umbrella using a hot shoe cable instead of Commander absolutely needs to get out of TTL BL mode (because head is not tilted up, and D-lens distance will mess it up). With the SB-700, the way to do that is either Spot Metering, or tilt the head, or Manual flash.</p><p></p><p>Again, Spot metering is about the ambient, the flash is still the same and is NOT doing Spot metering, but it does switch it out of Balanced flash mode, because then there is no metered ambient backgrond to balance. So flash simply becomes TTL mode. No Balanced effect.</p><p></p><p>Triggering:</p><p></p><p>For one single flash off camera, TTL will require the hot shoe type of cord (SC-28 etc, four shoe pins for CLS communication, basically still hot shoe). Or it could use Commander.</p><p></p><p>For one or multiple Manual flash off camera, then a few ways...</p><p></p><p>Optical slaves</p><p>Radio triggers</p><p>PC sync cord,</p><p>all in any combination. The one triggered manual flash can also be on a SC-28 type cord, or the internal flash in Manual mode.</p><p></p><p>Commander becomes NOT a possibility for mixed multiple manual flash... We cannot mix Commander with real Manual mode gear - not optical slaves, not flash meters, not radio triggers, not PC sync cords, etc. Choose one or the other system (Commander or Manual), and go with it, all the way.</p></blockquote><p></p>
[QUOTE="WayneF, post: 237101, member: 12496"] Yeah, I fear newcomers who have only seen a SB-700 or SB-400 or internal flash (who have not seen a menu to select TTL vs TTL BL) may not get the difference. TTL BL tries to automatically compensate the flash power lower in bright ambient light (called Balanced), like fill flash in sunlight becomes point&shoot. Same scene in TTL however, we have to compensate it manually, a couple of stops down from ambient. Indoors (assuming ambient too dim to be much concerned with), TTL BL ought to try to stay out of the way, and become equivalent to TTL mode. But sometimes (intermediate room light intensity), it gives slightly less exposure than TTL mode. Which is no big deal, we always have to watch both, and do what we see we need to do, either way, both cases. Same procedure, just a slightly different starting point. For any iTTL flash, remember flash compensation, and do what you see you need to do to get what you want. To trigger multiple iTTL flashes off camera, the Commander is required (if more than one iTTL flash). Only way for multiple iTTL (Commander will be TTL BL too, but commander knows it is off camera, and ignores the D-lens distance situation, it is not a problem. But hot shoe does not know.) Otherwise (not commander), a TTL BL flash off camera with head not tilted up will still be affected by the camera thinking the D-lens distance also applies to the flash, but which is at a different distance and different situation, maybe in an umbrella, but unknown to camera, who is still thinking "D-lens distance" and hot shoe direct flash. An umbrella using a hot shoe cable instead of Commander absolutely needs to get out of TTL BL mode (because head is not tilted up, and D-lens distance will mess it up). With the SB-700, the way to do that is either Spot Metering, or tilt the head, or Manual flash. Again, Spot metering is about the ambient, the flash is still the same and is NOT doing Spot metering, but it does switch it out of Balanced flash mode, because then there is no metered ambient backgrond to balance. So flash simply becomes TTL mode. No Balanced effect. Triggering: For one single flash off camera, TTL will require the hot shoe type of cord (SC-28 etc, four shoe pins for CLS communication, basically still hot shoe). Or it could use Commander. For one or multiple Manual flash off camera, then a few ways... Optical slaves Radio triggers PC sync cord, all in any combination. The one triggered manual flash can also be on a SC-28 type cord, or the internal flash in Manual mode. Commander becomes NOT a possibility for mixed multiple manual flash... We cannot mix Commander with real Manual mode gear - not optical slaves, not flash meters, not radio triggers, not PC sync cords, etc. Choose one or the other system (Commander or Manual), and go with it, all the way. [/QUOTE]
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