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Message: <blockquote data-quote="WayneF" data-source="post: 221719" data-attributes="member: 12496">It is not used on the camera.  It goes on the remote flash foot.  The cameras regular internal flash IN MANUAL MODE is what triggers it on the remote.The SU-4 is a hardware accessory optical slave trigger, <a href="http://www.bhphotovideo.com/c/product/158077-REG/Nikon_3070_SU_4_Wireless_Remote_Slave.html" target="_blank">Nikon SU-4 Wireless Remote Slave TTL Flash Controller 3070 B&H</a>The same function is already built into the SB-700, called SU-4 mode.  It could be added to the foot of the SB-600 to provide same function, but it costs $85.   It is a really good one, but $10 cheapies are available on Ebay.   Caution: Not all work on the SB-600, because it has a lower sync voltage than many, and this sync voltage is what powers the optical slave accessories.  First read <a href="http://www.scantips.com/lights/slaves.html" target="_blank">Optical slave triggers for speedlights</a>Tall light stands sound better, and a step ladder is common approach for the camera.   A camera level with the group sees front rows blocking view of the rear rows.  Height lets the camera (and the lights) look down into all rows of the group, without being blocked by front rows.Possibly.  You said "restaurant".  That is probably a 12 foot ceiling (tough for bounce power) and the ceiling may not be near white.The SB-600 is slightly stronger than the SB-700, but only about 1/3 stop.   Under a 12 foot regular acoustic tile white ceiling, this power for bounce probably needs ISO 800 to do f/5.   But restaurants are often NOT white ceilings.  Meeting rooms or country clubs, probably are high white ceiling, but many restaurants seem to like dark ceilings.Bounce does a lot to even the lighting from first row to last row (everyone is about same distance from ceiling).  Direct flash suffers badly from inverse square law falloff.  Twice the distance is two stops down (dark).   Lights back farther helps this (a little).  Less depth of fewer rows helps this (a little).     You are facing several difficult problems.  Large groups is one of the hardest problems.   You do need to try and see this stuff before the big event.   If the picture is important, you might consider hiring it to be done professionally.I dunno, maybe 1/30 second?  Cameras shake, and human subjects move.  Group distance helps though, does not show as much as if close up.DX just means you need a shorter lens than FX would need.  18mm zoom should be more than plenty on DX for a group.  18mm on DX is 66 degrees wide view.   This seems your least problem.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />And install bleacher type seats for the rows to stand on, while you're at it.   <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>

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