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<blockquote data-quote="WayneF" data-source="post: 211679" data-attributes="member: 12496">S1 would still be the same - it triggers from the first flash it sees, which it assumes is NOT TTL preflash.&nbsp; So yes, the triggering flash must be in manual mode too.&nbsp; &nbsp; If S1 saw a TTL mode, there will be a weaker preflash, which will trigger the remote slave flash too early, before the shutter is even open (so it will be useless).&nbsp; Yes, the triggering flash can contribute to the flash lighting, which might be desired (two flashes, one as on-camera fill).&nbsp; If not desired, normally we can set the manual level of the triggering flash to be at a low power level, so it hardly contributes if at all, but it still triggers the slave.&nbsp;&nbsp; To prevent undesired contribution, start with the lowest power level of the internal flash, and find the point where it will trigger the remote.&nbsp; Odds are reasonable that minimum trigger power will trigger it.&nbsp; If the head rotates, the remotes optical sensor on body should aim back at the camera to better detect the weakest flash from it.Yes, to use S2 mode, it will need to be triggered by TTL, with one preflash to be ignored, and the second flash to trigger.&nbsp;&nbsp; If the triggering slave were in manual mode, there would be no second flash to trigger the slave.&nbsp; &nbsp; Yes, the TTL triggering flash will try to do full point&amp;shoot exposure of the subject.&nbsp; You could dial it back with flash compensation, however S2 is really the dumb way to try this.&nbsp; S2 is really for casual users with compact cameras that cannot choose Manual flash.&nbsp; You can, so just use S1.It is not that S2 is great for anything, it only allows a larger market of compact camera users who have no manual flash mode.</blockquote>

[QUOTE="WayneF, post: 211679, member: 12496"] S1 would still be the same - it triggers from the first flash it sees, which it assumes is NOT TTL preflash. So yes, the triggering flash must be in manual mode too. If S1 saw a TTL mode, there will be a weaker preflash, which will trigger the remote slave flash too early, before the shutter is even open (so it will be useless). Yes, the triggering flash can contribute to the flash lighting, which might be desired (two flashes, one as on-camera fill). If not desired, normally we can set the manual level of the triggering flash to be at a low power level, so it hardly contributes if at all, but it still triggers the slave. To prevent undesired contribution, start with the lowest power level of the internal flash, and find the point where it will trigger the remote. Odds are reasonable that minimum trigger power will trigger it. If the head rotates, the remotes optical sensor on body should aim back at the camera to better detect the weakest flash from it. Yes, to use S2 mode, it will need to be triggered by TTL, with one preflash to be ignored, and the second flash to trigger. If the triggering slave were in manual mode, there would be no second flash to trigger the slave. Yes, the TTL triggering flash will try to do full point&shoot exposure of the subject. You could dial it back with flash compensation, however S2 is really the dumb way to try this. S2 is really for casual users with compact cameras that cannot choose Manual flash. You can, so just use S1. It is not that S2 is great for anything, it only allows a larger market of compact camera users who have no manual flash mode. [/QUOTE]

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