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<blockquote data-quote="WayneF" data-source="post: 601467" data-attributes="member: 12496">Should work fine if both manual flash.... TTL has added complication.&nbsp; radio trigger on TTL SB-600, which its&nbsp; early preflash will trigger the SU-4 mode early, before shutter opens.&nbsp; With most flashes, it's over then, no second flash again when shutter&nbsp; opens.&nbsp; SU-4 on Nikon flashes however is extremely fast, and unless at&nbsp; high power, it CAN flash again when shutter opens.&nbsp; Seems a poor way to&nbsp; plan the job however.&nbsp; You could use like a Yongnuo flash there, that&nbsp; has the S2 slave option, to ignore TTL preflash triggering.And perhaps if you can do TTL that way to one?&nbsp; I'm not familiar with&nbsp; the other TTL systems.&nbsp; The Nikon Commander however wont mix with other&nbsp; systems, including even true manual mode. The rule should be, if using Commander, all flashes should be controlled&nbsp; by commander. Which also means only two, maybe three flashes.I am skeptical of mixing TTL and manual, even if it works. As TTL varies&nbsp; the flash power, this varies the ratio of the other fixed manual light,&nbsp; which does not seem a plus.&nbsp; Ratio is an important factor to control.I think we may not be discussing Nikon Commander now, but No, I tried to&nbsp; explain that the Commander meters the TTL groups individually (a group&nbsp; is usually one light).&nbsp; Other TTL or Manual lights would NOT be on&nbsp; during that preflash metering.&nbsp; This individual metering was a new big&nbsp; deal in its day (ten years ago).&nbsp; It allows ratio.The commander sends special coded binary commands addressed to specific&nbsp; group addresses, and only that groups address responds to preflash.I cannot speak for what the various newer TTL systems might do now, but&nbsp; that is very different than say Nikon film TTL.&nbsp; Film TTL metered all&nbsp; flashes at same time, all at full power, but metering quenched all off&nbsp; at same instant, so there was no concept of controlled ratio, except for&nbsp; how you may have arranged flash distances. &nbsp;But today, Commander TTL meters each TTL flash individually, and sets corresponding flash power levels into each unit.</blockquote>

[QUOTE="WayneF, post: 601467, member: 12496"] Should work fine if both manual flash.... TTL has added complication. radio trigger on TTL SB-600, which its early preflash will trigger the SU-4 mode early, before shutter opens. With most flashes, it's over then, no second flash again when shutter opens. SU-4 on Nikon flashes however is extremely fast, and unless at high power, it CAN flash again when shutter opens. Seems a poor way to plan the job however. You could use like a Yongnuo flash there, that has the S2 slave option, to ignore TTL preflash triggering. And perhaps if you can do TTL that way to one? I'm not familiar with the other TTL systems. The Nikon Commander however wont mix with other systems, including even true manual mode. The rule should be, if using Commander, all flashes should be controlled by commander. Which also means only two, maybe three flashes. I am skeptical of mixing TTL and manual, even if it works. As TTL varies the flash power, this varies the ratio of the other fixed manual light, which does not seem a plus. Ratio is an important factor to control. I think we may not be discussing Nikon Commander now, but No, I tried to explain that the Commander meters the TTL groups individually (a group is usually one light). Other TTL or Manual lights would NOT be on during that preflash metering. This individual metering was a new big deal in its day (ten years ago). It allows ratio. The commander sends special coded binary commands addressed to specific group addresses, and only that groups address responds to preflash. I cannot speak for what the various newer TTL systems might do now, but that is very different than say Nikon film TTL. Film TTL metered all flashes at same time, all at full power, but metering quenched all off at same instant, so there was no concept of controlled ratio, except for how you may have arranged flash distances. But today, Commander TTL meters each TTL flash individually, and sets corresponding flash power levels into each unit. [/QUOTE]

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