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<blockquote data-quote="WayneF" data-source="post: 176902" data-attributes="member: 12496">Does the shutter actually fire?&nbsp;&nbsp; If for example, focus is not achieved, AF-S will not activate the shutter.&nbsp; No shutter, no flash.Does flash respond to the camera?&nbsp;&nbsp; Zooms with lens, shows aperture, etc?You are in mode A, S, M, or P?&nbsp;&nbsp; &quot;I never use Auto&quot; is NOT the same thing as telling what you are doing.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />The SB-600 should fire anytime it is on the hot shoe, and turned on.&nbsp; There are no settings, at least not on D5100. Except, Auto has its sister symbol that prohibits the flash... I guess that applies to the hot shoe too?See D5100 manual page 10.&nbsp; It says the ? is a Warning Indicator, see page 225.Page 226 (bottom) says a few things, none of which I get for this.But midpage (blinking ?) is more reasonable.It would indicate you have selected ISO and aperture or shutter that simply isn't enough for the light it sees.&nbsp;&nbsp; Select some other settings more beneficial to it.Or try P mode, so it can select better.My models don't do it that question mark way, so I'm not sure, but I would not expect it to blink if the flash was enabled.</blockquote>

[QUOTE="WayneF, post: 176902, member: 12496"] Does the shutter actually fire? If for example, focus is not achieved, AF-S will not activate the shutter. No shutter, no flash. Does flash respond to the camera? Zooms with lens, shows aperture, etc? You are in mode A, S, M, or P? "I never use Auto" is NOT the same thing as telling what you are doing. :) The SB-600 should fire anytime it is on the hot shoe, and turned on. There are no settings, at least not on D5100. Except, Auto has its sister symbol that prohibits the flash... I guess that applies to the hot shoe too? See D5100 manual page 10. It says the ? is a Warning Indicator, see page 225. Page 226 (bottom) says a few things, none of which I get for this. But midpage (blinking ?) is more reasonable. It would indicate you have selected ISO and aperture or shutter that simply isn't enough for the light it sees. Select some other settings more beneficial to it. Or try P mode, so it can select better. My models don't do it that question mark way, so I'm not sure, but I would not expect it to blink if the flash was enabled. [/QUOTE]

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