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Remote Flash Question
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<blockquote data-quote="WayneF" data-source="post: 110190" data-attributes="member: 12496"><p>Actually, a SU-4 is a separate hardware optical slave for any old Nikon flash, see <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></p><p></p><p>The same SU-4 function is built into some of the current CLS models, SB-700, SB-800, SB-900 (not the SB-400 or SB-600), so the menus just call it SU-4 mode, and old timers understand. It just means optical slave (but it is a really good one, sensitive).</p><p></p><p>So if adding another manual flash (could be another SB-700, or another Nikon with SU-4 in it, Or could even be an old or a cheapy other brand, etc, whatever, so long as it can do manual flash), and you could use a SU-4 unit (above), or you can just add a $10 class Ebay cheapy optical slave to the flash foot of those. See <a href="http://www.scantips.com/lights/slaves.html" target="_blank">Optical slave triggers for speedlights</a> They won't have the same impressive range (triggering), but they will work indoors in most situations.</p><p></p><p></p><p>This next is unimportant today, with your digital camera, but the history is that the SU-4 was rather special. It was not your ordinary optical slave. More sensitive than most, but it also provided multiple remote TTL flash for film cameras doing film TTL. </p><p></p><p>Film TTL: The camera watched and metered the real time flash reflected from the film surface. When it saw enough light, it quenched the camera hot shoe flash off, to terminate the flash exposure. The remote units with SU-4 watched this master, and the SU-4 Auto mode tells them to stop when the master stopped. So this was multi-flash TTL for film cameras. The individual lights could not be metered or controlled, but they all could quit at once.</p><p></p><p></p><p>Digital iTTL: The digital sensor cannot reflect like film did (anti-aliasing filter, etc). So now, iTTL fires a preflash which the camera meters, and the camera sets the flash units power level accordingly, then the shutter opens and the flashes are triggered, and the flashes use the power they were programmed to be. Other than one single flash on the hot shoe (communication), this requires the Commander to do multiple iTTL flash (to do this communication). But, now each light can be metered and controlled individually. So there are pluses and minuses, but the technology changes.</p></blockquote><p></p>
[QUOTE="WayneF, post: 110190, member: 12496"] Actually, a SU-4 is a separate hardware optical slave for any old Nikon flash, see [URL="http://www.bhphotovideo.com/c/product/158077-REG/Nikon_3070_SU_4_Wireless_Remote_Slave.html"]Nikon SU-4 Wireless Remote Slave TTL Flash Controller 3070 B&H[/URL] The same SU-4 function is built into some of the current CLS models, SB-700, SB-800, SB-900 (not the SB-400 or SB-600), so the menus just call it SU-4 mode, and old timers understand. It just means optical slave (but it is a really good one, sensitive). So if adding another manual flash (could be another SB-700, or another Nikon with SU-4 in it, Or could even be an old or a cheapy other brand, etc, whatever, so long as it can do manual flash), and you could use a SU-4 unit (above), or you can just add a $10 class Ebay cheapy optical slave to the flash foot of those. See [URL="http://www.scantips.com/lights/slaves.html"]Optical slave triggers for speedlights[/URL] They won't have the same impressive range (triggering), but they will work indoors in most situations. This next is unimportant today, with your digital camera, but the history is that the SU-4 was rather special. It was not your ordinary optical slave. More sensitive than most, but it also provided multiple remote TTL flash for film cameras doing film TTL. Film TTL: The camera watched and metered the real time flash reflected from the film surface. When it saw enough light, it quenched the camera hot shoe flash off, to terminate the flash exposure. The remote units with SU-4 watched this master, and the SU-4 Auto mode tells them to stop when the master stopped. So this was multi-flash TTL for film cameras. The individual lights could not be metered or controlled, but they all could quit at once. Digital iTTL: The digital sensor cannot reflect like film did (anti-aliasing filter, etc). So now, iTTL fires a preflash which the camera meters, and the camera sets the flash units power level accordingly, then the shutter opens and the flashes are triggered, and the flashes use the power they were programmed to be. Other than one single flash on the hot shoe (communication), this requires the Commander to do multiple iTTL flash (to do this communication). But, now each light can be metered and controlled individually. So there are pluses and minuses, but the technology changes. [/QUOTE]
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