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<blockquote data-quote="LouCioccio" data-source="post: 596583" data-attributes="member: 12542"><p>The sensor is reading the light off the subject. When using TTL you should be concerned about shutter speed, ambient light and ISO. If you have an external flash like the SB700 and you have it in TTL (it has other modes on slide switch) you will see when focus a red light flash quickly on your subject this is also the focus assist light. The sensor will receive a burst light to determine proper exposure ahh but I set my camera to M-mode selected a shutter speed of 1/125, F/4, ISO 400 it was evening dark out side so I had LED daylight bulbs on. And I just realized Iridient RAW stripped the EXIF (?) not sure why. At the ISO 400 I am allowing more ambient light to fall in the background.</p><p></p><p>If the sensors were pointed toward the umbrella it would think (<u>remember cameras and computers are dumber than a box of rocks</u> it going take an exposure of white umbrella at 18% gray <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" />. Here is a couple of links explaining TTL.</p><p></p><p>If I would be shooting in total manual power mode I would not be concerned about the sensor on the Flash.</p><p></p><p><a href="http://www.exposureguide.com/ttl-flash-metering.htm" target="_blank">TTL Flash Metering | Understanding Through-the-Lens Flash Metering</a></p><p></p><p></p><p><a href="https://rolandlim.wordpress.com/2011/02/23/a-simple-guide-to-ttl-flash-photography/" target="_blank">https://rolandlim.wordpress.com/2011/02/23/a-simple-guide-to-ttl-flash-photography/</a></p><p></p><p>Lou Cioccio</p></blockquote><p></p>
[QUOTE="LouCioccio, post: 596583, member: 12542"] The sensor is reading the light off the subject. When using TTL you should be concerned about shutter speed, ambient light and ISO. If you have an external flash like the SB700 and you have it in TTL (it has other modes on slide switch) you will see when focus a red light flash quickly on your subject this is also the focus assist light. The sensor will receive a burst light to determine proper exposure ahh but I set my camera to M-mode selected a shutter speed of 1/125, F/4, ISO 400 it was evening dark out side so I had LED daylight bulbs on. And I just realized Iridient RAW stripped the EXIF (?) not sure why. At the ISO 400 I am allowing more ambient light to fall in the background. If the sensors were pointed toward the umbrella it would think ([U]remember cameras and computers are dumber than a box of rocks[/U] it going take an exposure of white umbrella at 18% gray :rolleyes:. Here is a couple of links explaining TTL. If I would be shooting in total manual power mode I would not be concerned about the sensor on the Flash. [url=http://www.exposureguide.com/ttl-flash-metering.htm]TTL Flash Metering | Understanding Through-the-Lens Flash Metering[/url] [url]https://rolandlim.wordpress.com/2011/02/23/a-simple-guide-to-ttl-flash-photography/[/url] Lou Cioccio [/QUOTE]
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