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<blockquote data-quote="WayneF" data-source="post: 235491" data-attributes="member: 12496">Actually, for any iTTL flash, it is the camera that orders the preflash, meters it, computes necessary exposure shift, and programs the flash unit for that power level.&nbsp;&nbsp; The flash does have to perform that level accurately, consistently, reliably, etc (including preflash), but then all it has to do is to flash when triggered.No.1. The Nikon system only does iTTL on the hot shoe, or connected to it via a hot shoe extension cord (SC-28 cord), for only one flash.2. Or for multiple iTTL flash, it only works Remotely using the Commander, which is wireless (and which the D3100 and D5100 family do not have).&nbsp;&nbsp; Of these, only the 568 can do 2.&nbsp; The 565 or 568 can do 1 (any iTTL flash can do 1).&nbsp;&nbsp; If your camera has no commander, then you cannot use and do not need 2 at this time.&nbsp; Some future camera might use those features.&nbsp; Meanwhile, the 568 does anything the 565 can do.Exception:&nbsp; You could put a flash on the hot shoe which does include a commander in the flash, for example, the SB-700 (or the SU-800 which is a commander without a flash).&nbsp; Then the D3100/D5100 families can use remote wireless TTL flash, because they have a commander then.&nbsp; However, they still do not have FV Lock, which is needed to prevent pictures of the subject blinking.Likewise Auto FP HSS flash (fast shutter speeds) -&nbsp; of these Yongnuo flash,&nbsp; only the 568 has that, and only the camera bodies with Commander have That too.&nbsp; Again, both units must have it to work.Any PC sync cable or optical slave is necessarily limited to manual flash mode.&nbsp; Any system with only one contact pin...&nbsp; &nbsp;&nbsp; So the vast majority of radio triggers are also manual flash only.</blockquote>

[QUOTE="WayneF, post: 235491, member: 12496"] Actually, for any iTTL flash, it is the camera that orders the preflash, meters it, computes necessary exposure shift, and programs the flash unit for that power level. The flash does have to perform that level accurately, consistently, reliably, etc (including preflash), but then all it has to do is to flash when triggered. No. 1. The Nikon system only does iTTL on the hot shoe, or connected to it via a hot shoe extension cord (SC-28 cord), for only one flash. 2. Or for multiple iTTL flash, it only works Remotely using the Commander, which is wireless (and which the D3100 and D5100 family do not have). Of these, only the 568 can do 2. The 565 or 568 can do 1 (any iTTL flash can do 1). If your camera has no commander, then you cannot use and do not need 2 at this time. Some future camera might use those features. Meanwhile, the 568 does anything the 565 can do. Exception: You could put a flash on the hot shoe which does include a commander in the flash, for example, the SB-700 (or the SU-800 which is a commander without a flash). Then the D3100/D5100 families can use remote wireless TTL flash, because they have a commander then. However, they still do not have FV Lock, which is needed to prevent pictures of the subject blinking. Likewise Auto FP HSS flash (fast shutter speeds) - of these Yongnuo flash, only the 568 has that, and only the camera bodies with Commander have That too. Again, both units must have it to work. Any PC sync cable or optical slave is necessarily limited to manual flash mode. Any system with only one contact pin... So the vast majority of radio triggers are also manual flash only. [/QUOTE]

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