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Message: <blockquote data-quote="WayneF" data-source="post: 363384" data-attributes="member: 12496">Handheld flash meters are generally incompatible with the Commander.  The handheld meter is for real actual genuine Manual mode (the mode called M on the flash - no commander).  This will need a way to trigger the flash to be metered. The conventional way is to use a cord from meter to flash, to trigger that flash for purpose of metering.  Then you move cord to next flash, to set it, etc.  Then move the cord from meter to camera for the shoot.If using TTL flash mode, the flash first does a low level preflash for the camera to meter.  This interferes with a handheld meter, which meters it instead.  So  the handheld meter simply cannot be used with TTL (and of course, it makes no sense to try to use it for TTL. The camera is metering it, and you have no way for the external meter to control anything in TTL mode).If using the Commander (any mode, including its manual mode), the commander first sends various low level flash signals to (each) remote (request for preflash, sending the manual menu power level, etc), and this flashing drastically interferes with any hand held meter.  You meter the command level instead.   The Sekonic is filtered to keep out infrared, so you could put a Nikon SG-3IR filter on the commander to output only infrared, and then it could work for manual flash, if the Sekonic is at least maybe five or six feet from the Commander (filters are not perfect, leakage occurs, precautions are necessary - try blocking the commander path with your body). And any TTL remote flash is still going to do preflash, which interferes.I don't know what the 622 does, but any remote TTL flash still does preflash immediately before any flash.</blockquote>

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