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<blockquote data-quote="WayneF" data-source="post: 543067" data-attributes="member: 12496">Maybe that is some 622 issue then, that I don't know about.&nbsp; Because I make no sense of &quot;early&quot; or of 1/125 second.&nbsp;&nbsp; HSS does not begin on a D800 until at least 1/320, or optionally at least 1/400 second.&nbsp; At lesser speeds, it is regular speedlght mode (not HSS) and flash exposure is independent of shutter speed (at lesser speeds than Auto FP trigger point).You should be able to isolate any 622 issue (if any) by trying same thing with flash directly on the hot shoe.&nbsp; It either works the same, or it does not.For a&nbsp; hot shoe flash, TTL of course does its TTL preflash just before the shutter&nbsp; opens (to be metered to set TTL level), but normally it is too close to&nbsp; the actual flash to distinguish it visually as a separate flash.&nbsp; I'm still guessing just not enough HSS flash level to show up. If your distance is great (say 20 feet), that would be expected for HSS.</blockquote>

[QUOTE="WayneF, post: 543067, member: 12496"] Maybe that is some 622 issue then, that I don't know about. Because I make no sense of "early" or of 1/125 second. HSS does not begin on a D800 until at least 1/320, or optionally at least 1/400 second. At lesser speeds, it is regular speedlght mode (not HSS) and flash exposure is independent of shutter speed (at lesser speeds than Auto FP trigger point). You should be able to isolate any 622 issue (if any) by trying same thing with flash directly on the hot shoe. It either works the same, or it does not. For a hot shoe flash, TTL of course does its TTL preflash just before the shutter opens (to be metered to set TTL level), but normally it is too close to the actual flash to distinguish it visually as a separate flash. I'm still guessing just not enough HSS flash level to show up. If your distance is great (say 20 feet), that would be expected for HSS. [/QUOTE]

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