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<blockquote data-quote="WayneF" data-source="post: 114399" data-attributes="member: 12496">Right, the electronic flash unit sync is instantaneous (X sync), no matter how you do it...&nbsp;&nbsp; Hot shoe, PC sync cord, optical slave, all are instantaneous, speed of light so to speak.&nbsp; Radio triggers almost are almost as fast as shutter sync speed, but some can suffer delays.&nbsp; Esp with low batteries.&nbsp; There is a difference.&nbsp; If you have a camera with a CCD electronic shutter instead of a focal plane shutter, then the camera has no sync issues either.&nbsp;&nbsp; Like with a D40 or D70 camera, you can sync speedlights at any fast shutter speed, like 1/2000 second (if you use a PC sync cord so the camera software won't know the flash is there).&nbsp;&nbsp; These are more crummy shutters, but they are fast (i.e., all the frame is open at once, even fast).&nbsp;&nbsp; But radio trigger delay generally will not sync faster than conventional shutter sync speeds, if even that.Why radio triggers have more delay, I don't know. I compare it to a voice signal over radio, the voice saying &quot;Do it right NOW!&quot;, and then we do it right now, but it takes several milliseconds for that voice to be said and transmitted and listened to and recognized. That is a delay, esp at instantaneous speeds.</blockquote>

[QUOTE="WayneF, post: 114399, member: 12496"] Right, the electronic flash unit sync is instantaneous (X sync), no matter how you do it... Hot shoe, PC sync cord, optical slave, all are instantaneous, speed of light so to speak. Radio triggers almost are almost as fast as shutter sync speed, but some can suffer delays. Esp with low batteries. There is a difference. If you have a camera with a CCD electronic shutter instead of a focal plane shutter, then the camera has no sync issues either. Like with a D40 or D70 camera, you can sync speedlights at any fast shutter speed, like 1/2000 second (if you use a PC sync cord so the camera software won't know the flash is there). These are more crummy shutters, but they are fast (i.e., all the frame is open at once, even fast). But radio trigger delay generally will not sync faster than conventional shutter sync speeds, if even that. Why radio triggers have more delay, I don't know. I compare it to a voice signal over radio, the voice saying "Do it right NOW!", and then we do it right now, but it takes several milliseconds for that voice to be said and transmitted and listened to and recognized. That is a delay, esp at instantaneous speeds. [/QUOTE]

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