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TTL - What were those settings?
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<blockquote data-quote="WayneF" data-source="post: 113882" data-attributes="member: 12496"><p>OK, I have to admit to not paying much attention. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p></p><p></p><p>Why they differ is because there is some metering area. We may not always be clear on what that area is, or its size extent or definition or rules (which is your debate), but we do know all metered areas try to convert to a middle gray result. Simply what meters do. Only possible thing they can do. Because, they can only see a spot of light, and can measure it, but the dumb silicon chip cannot recognize if is your Aunt Jane or a kumquat bush. It has absolutely no clue what it is, or how it ought to be. The meter knows nothing that humans know in a glance, we know what it is and how it should be. So, what the meter can do is that dark colors (like black) are made to be gray, or lighter (overexposed). Light things (like white) are made to be gray, darker, underexposed. So if you introduce white into the metered area, it is going to get darker. There is no other choice.</p><p></p><p>I agree that no one knows what Matrix metering does. It is just a dumb computer with no clue what our image is or how it should be, but nevertheless it is a computer program, designed to make assumptions about our pixels, and trying to do something to "help" us, or so marketing says. Nikon does not tell us what Matrix does, we simply do not know, not even a first clue. It would be good if they would tell, but they probably cannot. Frankly, I can almost understand and visualize what Center metering does, and will do, and which I can predict, and that concept is easy and understood, so I greatly prefer it, rather than guessing about it.</p><p></p><p>TTL BL is the same in smaller degree, a small subset with much less scope, but since any two correct exposures of any two lights (like sunlight and TTL flash, or like two TTL flashes, etc)... when and if any two lights combine, and if both are correct exposure, then that is two exposures worth, and one stop overexposure by definition. That is what TTL will do in sunlight for example, so photographers know they have to compensate it. The TTL goal is to meter the flash and to give a correct flash exposure, regardless, no matter what (often correct indoors). Whereas TTL BL has the single goal of auto compensation, of backing off on the flash (called fill flash, balanced with ambient) - to avoid this combining situation. Often to a fault when there is no significant other light, but it is not risking overexposure.</p></blockquote><p></p>
[QUOTE="WayneF, post: 113882, member: 12496"] OK, I have to admit to not paying much attention. :) Why they differ is because there is some metering area. We may not always be clear on what that area is, or its size extent or definition or rules (which is your debate), but we do know all metered areas try to convert to a middle gray result. Simply what meters do. Only possible thing they can do. Because, they can only see a spot of light, and can measure it, but the dumb silicon chip cannot recognize if is your Aunt Jane or a kumquat bush. It has absolutely no clue what it is, or how it ought to be. The meter knows nothing that humans know in a glance, we know what it is and how it should be. So, what the meter can do is that dark colors (like black) are made to be gray, or lighter (overexposed). Light things (like white) are made to be gray, darker, underexposed. So if you introduce white into the metered area, it is going to get darker. There is no other choice. I agree that no one knows what Matrix metering does. It is just a dumb computer with no clue what our image is or how it should be, but nevertheless it is a computer program, designed to make assumptions about our pixels, and trying to do something to "help" us, or so marketing says. Nikon does not tell us what Matrix does, we simply do not know, not even a first clue. It would be good if they would tell, but they probably cannot. Frankly, I can almost understand and visualize what Center metering does, and will do, and which I can predict, and that concept is easy and understood, so I greatly prefer it, rather than guessing about it. TTL BL is the same in smaller degree, a small subset with much less scope, but since any two correct exposures of any two lights (like sunlight and TTL flash, or like two TTL flashes, etc)... when and if any two lights combine, and if both are correct exposure, then that is two exposures worth, and one stop overexposure by definition. That is what TTL will do in sunlight for example, so photographers know they have to compensate it. The TTL goal is to meter the flash and to give a correct flash exposure, regardless, no matter what (often correct indoors). Whereas TTL BL has the single goal of auto compensation, of backing off on the flash (called fill flash, balanced with ambient) - to avoid this combining situation. Often to a fault when there is no significant other light, but it is not risking overexposure. [/QUOTE]
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