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Message: <blockquote data-quote="WayneF" data-source="post: 400764" data-attributes="member: 12496">In TTL mode, yes, that is what TTL is ... camera metering controls the flash power.  The camera TTL metering system requests a weak TTL preflash, which it meters, and then camera sets the flash power level to a proper value for the final flash.  If we might prefer that result to be slightly different, more or less flash, then we apply a bit of flash compensation (which changes the metering goal ... relative to the cameras metering goal).In Manual flash mode, no, we set the absolute flash power level ourselves, directly.  Camera offers no help, other than we can see the result.  If we want a different result, we set a different flash level (flash compensation is ignored by manual flash mode).</blockquote>