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<blockquote data-quote="ohkphoto" data-source="post: 6101" data-attributes="member: 1573">I kind of figured that, but not really knowing how the cls works exactly, I feel a little lost.&nbsp; Here's an example, if I use the sb-900 as a main light and the sb-600 as a fill light, it's workable and I can make + or - EV adjustments for each flash on the camera.&nbsp; If I move one of them to use as a backlight for the subject, it gets really bizarre . . . seems to throw the system off&nbsp; (&quot;pilot&quot; error, I'm sure)&nbsp; . . .mostly seriously underexposed. . . so what I would really like to know is what is being emitted from which flashes to where, and how does this tie into the camera (iTTL)?&nbsp;The more I talk about this, the more confused I get&nbsp;&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; &nbsp;&nbsp; I need a detailed primer on nikons CLS</blockquote>

[QUOTE="ohkphoto, post: 6101, member: 1573"] I kind of figured that, but not really knowing how the cls works exactly, I feel a little lost. Here's an example, if I use the sb-900 as a main light and the sb-600 as a fill light, it's workable and I can make + or - EV adjustments for each flash on the camera. If I move one of them to use as a backlight for the subject, it gets really bizarre . . . seems to throw the system off ("pilot" error, I'm sure) . . .mostly seriously underexposed. . . so what I would really like to know is what is being emitted from which flashes to where, and how does this tie into the camera (iTTL)? The more I talk about this, the more confused I get :-) I need a detailed primer on nikons CLS [/QUOTE]

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