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Message: <blockquote data-quote="skene" data-source="post: 489366" data-attributes="member: 13155">Well like rocketman explained already, the difference is the adjust-ability and to change most settings on the fly from the TTL compatible unit.  Whereas, with non TTL, you will need to manually adjust settings from the flash units themselves as the triggers will only set off the flash when it reads that the shutter button is pressed.   This is where, "you get what you pay for" comes into play.  Now once again, this is only where a flash unit is also TTL compatible.  So if the flash unit and transceiver/receiver is not TTL compatible it will not allow for remote adjustments.</blockquote>