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<blockquote data-quote="WayneF" data-source="post: 316669" data-attributes="member: 12496">You simply cannot use any simple slave type flash with commander system.&nbsp; Period.&nbsp;&nbsp; The commander absolutely requires commander-compatible flash units.The commander flashes a few signals before the shutter opens.&nbsp; These are signals to request TTL preflash from the remotes, and to set TTL power level, or to set Manual mode power level.&nbsp; It does this for groups A and B sequentially, unless one group is turned off.&nbsp; But there is a lot of flashing.The SB-600 and other commander-compatible models are designed to understand all of this.The simple slave flash never heard of a commander, and its slave will flash at these early signals, before the shutter opens.&nbsp;&nbsp; Normally the problem is that the slave simply cannot contribute to the picture lighting in this situation, but the flash from the slave can mix with the TTL preflash, and seriously confuse the camera trying to meter the preflash.I have not heard of the situation where the SB-600 simply goes crazy and quits, but regardless, there simply is no case when the simple slave can work right with the commander system.&nbsp;&nbsp; Get rid of it.&nbsp; &nbsp; You instead need another SB-600 type of flash, designed for the Commander.Or otherwise, turn off the commander, and go to an all-manual flash system - genuine manual flash in all units, with the commander turned off. The SB-600 in its menu mode M instead of Remote.&nbsp; Then you have to figure some way to trigger it.</blockquote>

[QUOTE="WayneF, post: 316669, member: 12496"] You simply cannot use any simple slave type flash with commander system. Period. The commander absolutely requires commander-compatible flash units. The commander flashes a few signals before the shutter opens. These are signals to request TTL preflash from the remotes, and to set TTL power level, or to set Manual mode power level. It does this for groups A and B sequentially, unless one group is turned off. But there is a lot of flashing. The SB-600 and other commander-compatible models are designed to understand all of this. The simple slave flash never heard of a commander, and its slave will flash at these early signals, before the shutter opens. Normally the problem is that the slave simply cannot contribute to the picture lighting in this situation, but the flash from the slave can mix with the TTL preflash, and seriously confuse the camera trying to meter the preflash. I have not heard of the situation where the SB-600 simply goes crazy and quits, but regardless, there simply is no case when the simple slave can work right with the commander system. Get rid of it. You instead need another SB-600 type of flash, designed for the Commander. Or otherwise, turn off the commander, and go to an all-manual flash system - genuine manual flash in all units, with the commander turned off. The SB-600 in its menu mode M instead of Remote. Then you have to figure some way to trigger it. [/QUOTE]

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