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<blockquote data-quote="WayneF" data-source="post: 200633" data-attributes="member: 12496">The internal flash is both a flash unit and the Commander.&nbsp; We can set the mode (in commander menu) of the internal flash to be &quot;- -&quot;, which disables it from contributing lighting into the picture (turns it off).&nbsp;&nbsp; But it is still the commander, and it still must flash commands to the remote units, which occur Before the shutter opens.&nbsp; Humans see that, but the picture does not.But.... then after the shutter opens, the commander must still flash a &quot;Everybody fire NOW&quot; trigger signal to the remotes.&nbsp; There is no other way, like any optical slave trigger then.&nbsp;&nbsp; This is a very low level flash, normally quite insignificant to the exposure of anything.With two exceptions. For macro work, the flash may only be a few inches from the the subject, and even minimum power is still something.And two, shiny reflective&nbsp; things in subject at a few feet might still show a catchlight from this flash.&nbsp; Like human eyeballs in a portrait, might show a catchlight.Nikon makes the $12 SG-3IR filter panel for the hot shoe, for these special cases, which can cover the commander flash, to block visible light affecting our pictures, but still allows the infrared commander signals to pass.&nbsp; Normally, it is not needed, however it can always help to also minimize blinking by subjects at the commander flashes. The SU-800 commander builds in this same red infrared filter.See <a href="http://www.scantips.com/lights/awl.html#panel" target="_blank">Using the Nikon CLS Remote Wireless Flash System</a>&nbsp;&nbsp; for much more about this situation.</blockquote>

[QUOTE="WayneF, post: 200633, member: 12496"] The internal flash is both a flash unit and the Commander. We can set the mode (in commander menu) of the internal flash to be "- -", which disables it from contributing lighting into the picture (turns it off). But it is still the commander, and it still must flash commands to the remote units, which occur Before the shutter opens. Humans see that, but the picture does not. But.... then after the shutter opens, the commander must still flash a "Everybody fire NOW" trigger signal to the remotes. There is no other way, like any optical slave trigger then. This is a very low level flash, normally quite insignificant to the exposure of anything. With two exceptions. For macro work, the flash may only be a few inches from the the subject, and even minimum power is still something. And two, shiny reflective things in subject at a few feet might still show a catchlight from this flash. Like human eyeballs in a portrait, might show a catchlight. Nikon makes the $12 SG-3IR filter panel for the hot shoe, for these special cases, which can cover the commander flash, to block visible light affecting our pictures, but still allows the infrared commander signals to pass. Normally, it is not needed, however it can always help to also minimize blinking by subjects at the commander flashes. The SU-800 commander builds in this same red infrared filter. See [URL="http://www.scantips.com/lights/awl.html#panel"]Using the Nikon CLS Remote Wireless Flash System[/URL] for much more about this situation. [/QUOTE]

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