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TTL - What were those settings?
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<blockquote data-quote="WayneF" data-source="post: 113705" data-attributes="member: 12496"><p>LOL. Yes, we certainly can read many things on the internet. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> You can count this as just another one, or the hope is that you can try it yourself to see how it actually does work. Desmond does try hard, but he makes big leaps to conclusions, and FWIW, I question many of them. </p><p></p><p>If you care where flash meters, then you definitely ought to try it yourself. Let me show you. Here is a black card, a gray card, and white card, conveniently taped to my TV screen at about six feet. This is a D800, it is newer than Desmond's proverbial D100. My D300 also does the same as this. And a hot shoe SB-800 flash. ISO 400, f/5, 1/200 second. A real simple situation, point and shoot, except the focus sensor was moved on each. Done in five minutes, this morning, just for you. This is VERY repeatable. Unadjusted here, TTL BL is often a bit underexposed (just needs simple compensation).</p><p></p><p>First row is direct TTL BL flash in Matrix metering mode. Focus sensor left to right is on the three cards.</p><p></p><p>Second row is bounce, TTL BL in Matrix metering mode. Focus sensor left to right is on the three cards. (ten foot ceiling, seven feet up)</p><p></p><p>The focus sensor was moved left to right, which really could not matter less here which way it moved, since there is no difference.</p><p></p><p></p><p><img src="http://www.scantips.com/g2/800_2175.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.scantips.com/g2/800_2176.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.scantips.com/g2/800_2177.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p><img src="http://www.scantips.com/g2/800_2178.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.scantips.com/g2/800_2179.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.scantips.com/g2/800_2180.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>There are two metering systems in there. Ambient is in fact metered at the sensor, but this is insignificant ambient, shutter speed 1/200 second to keep it out.</p><p></p><p>We know that if it actually metered flash on the black card, black would necessarily be gray, and we would need about -2EV compensation to make it show as black (but we don't here).</p><p></p><p>And we know that if it actually metered on the white card, white would necessarily be gray, and we would need about +2EV compensation to make it show as white (but we don't here).</p><p></p><p>Point is, these are all alike, all are actually metered on a central area, regardless of focus point. You should try this yourself, to know.</p><p></p><p>I left white balance at Flash WB, unadjusted, just to make another point. We also know that flash color varies with flash power, and this is two extremes. Near direct flash at low power will be blue (if speedlights), and full flash power can be slightly red. There is about 1000K difference in these two sets, unadjusted (again, this is two extremes).</p></blockquote><p></p>
[QUOTE="WayneF, post: 113705, member: 12496"] LOL. Yes, we certainly can read many things on the internet. ;) You can count this as just another one, or the hope is that you can try it yourself to see how it actually does work. Desmond does try hard, but he makes big leaps to conclusions, and FWIW, I question many of them. If you care where flash meters, then you definitely ought to try it yourself. Let me show you. Here is a black card, a gray card, and white card, conveniently taped to my TV screen at about six feet. This is a D800, it is newer than Desmond's proverbial D100. My D300 also does the same as this. And a hot shoe SB-800 flash. ISO 400, f/5, 1/200 second. A real simple situation, point and shoot, except the focus sensor was moved on each. Done in five minutes, this morning, just for you. This is VERY repeatable. Unadjusted here, TTL BL is often a bit underexposed (just needs simple compensation). First row is direct TTL BL flash in Matrix metering mode. Focus sensor left to right is on the three cards. Second row is bounce, TTL BL in Matrix metering mode. Focus sensor left to right is on the three cards. (ten foot ceiling, seven feet up) The focus sensor was moved left to right, which really could not matter less here which way it moved, since there is no difference. [IMG]http://www.scantips.com/g2/800_2175.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_2176.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_2177.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_2178.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_2179.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_2180.jpg[/IMG] There are two metering systems in there. Ambient is in fact metered at the sensor, but this is insignificant ambient, shutter speed 1/200 second to keep it out. We know that if it actually metered flash on the black card, black would necessarily be gray, and we would need about -2EV compensation to make it show as black (but we don't here). And we know that if it actually metered on the white card, white would necessarily be gray, and we would need about +2EV compensation to make it show as white (but we don't here). Point is, these are all alike, all are actually metered on a central area, regardless of focus point. You should try this yourself, to know. I left white balance at Flash WB, unadjusted, just to make another point. We also know that flash color varies with flash power, and this is two extremes. Near direct flash at low power will be blue (if speedlights), and full flash power can be slightly red. There is about 1000K difference in these two sets, unadjusted (again, this is two extremes). [/QUOTE]
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