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<blockquote data-quote="WayneF" data-source="post: 228497" data-attributes="member: 12496">Yes, you should be able to use the popup flash at its Minimum manual power to trigger the Nikon SU-4 mode flashes.SB-700 and SB-800 has the SU-4 mode optical slave trigger, but the SB-600 does not.&nbsp; An inexpensive accessory can be added to the foot of the SB-600 to add it, but the SB-600 is special - it has lower sync voltage than many flashes, and this is what powers the slave, and some don't work, others do.&nbsp; See <a href="http://www.scantips.com/lights/slaves.html" target="_blank">Optical slave triggers for speedlights</a> regarding this.Fill flash is most desirably placed near camera lens axis.&nbsp;&nbsp; On axis lighting is by definition even (flat).&nbsp; It makes shadows behind the subject, but ON THE SUBJECT, this evenness is near shadowless.&nbsp;&nbsp; However fill normally uses an umbrella anyway, but there are worse things than direct fill.&nbsp; Outside in bright sun with hot shoe flash would be an obvious exception.Only a tiny very few high end radio triggers can offer TTL.&nbsp; Most are manual flash only.&nbsp; Optical slaves are manual flash only also.It varies with zoom, but at 24mm (in an umbrella), the SB-800 is maybe 0.4 stop more power than a SB-600.&nbsp; SB-700 is maybe 0.8 stop less than SB-800 (24mm FX).</blockquote>

[QUOTE="WayneF, post: 228497, member: 12496"] Yes, you should be able to use the popup flash at its Minimum manual power to trigger the Nikon SU-4 mode flashes. SB-700 and SB-800 has the SU-4 mode optical slave trigger, but the SB-600 does not. An inexpensive accessory can be added to the foot of the SB-600 to add it, but the SB-600 is special - it has lower sync voltage than many flashes, and this is what powers the slave, and some don't work, others do. See [URL="http://www.scantips.com/lights/slaves.html"]Optical slave triggers for speedlights[/URL] regarding this. Fill flash is most desirably placed near camera lens axis. On axis lighting is by definition even (flat). It makes shadows behind the subject, but ON THE SUBJECT, this evenness is near shadowless. However fill normally uses an umbrella anyway, but there are worse things than direct fill. Outside in bright sun with hot shoe flash would be an obvious exception. Only a tiny very few high end radio triggers can offer TTL. Most are manual flash only. Optical slaves are manual flash only also. It varies with zoom, but at 24mm (in an umbrella), the SB-800 is maybe 0.4 stop more power than a SB-600. SB-700 is maybe 0.8 stop less than SB-800 (24mm FX). [/QUOTE]

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