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<blockquote data-quote="WayneF" data-source="post: 257401" data-attributes="member: 12496">Manual flash should work. There is no preflash, therefore no possible reason to think the flash is causing the blink that time.&nbsp; It likely was just anticipation of the flash.&nbsp; Manual flash mode is of course set on the hot shoe flash itself, NOT in the camera menu.Try this again, it should work.&nbsp; But to prevent anticipating the flash, surprise her a bit, instead of counting 1, 2, 3, now!&nbsp; Hold back a bit longer, let her get the blink over with.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp;&nbsp; Manual flash durations are much faster than human reaction times.FV Lock is best solution, but unfortunately only present on camera models that also have commander.&nbsp; It is a great solution, basically converts to mimic Manual flash (in regard to preflash). Some people just blink much more easily than others.&nbsp; It is not her fault, it is your problem to solve.This will have no effect on the blinking... the delay may insure blinking if anything.However, you can use Rear Curtain as a one time test to verify there is no preflash on Manual flash. No subject needed, just watch the flash.&nbsp; Use Rear Curtain with a long shutter speed, at least one second (a correct exposure is not important this time).&nbsp;&nbsp; The one second just separates the two flashes so that humans can distinguish it as seeing two flashes.&nbsp; TTL mode will see two flashes, one just before shutter opens (preflash), and one at the one second end of shutter duration.&nbsp; Manual flash will only see one flash, at the end of the long shutter duration.&nbsp; i.e.,&nbsp; there is no preflash with Manual mode flash.</blockquote>

[QUOTE="WayneF, post: 257401, member: 12496"] Manual flash should work. There is no preflash, therefore no possible reason to think the flash is causing the blink that time. It likely was just anticipation of the flash. Manual flash mode is of course set on the hot shoe flash itself, NOT in the camera menu. Try this again, it should work. But to prevent anticipating the flash, surprise her a bit, instead of counting 1, 2, 3, now! Hold back a bit longer, let her get the blink over with. :) Manual flash durations are much faster than human reaction times. FV Lock is best solution, but unfortunately only present on camera models that also have commander. It is a great solution, basically converts to mimic Manual flash (in regard to preflash). Some people just blink much more easily than others. It is not her fault, it is your problem to solve. This will have no effect on the blinking... the delay may insure blinking if anything. However, you can use Rear Curtain as a one time test to verify there is no preflash on Manual flash. No subject needed, just watch the flash. Use Rear Curtain with a long shutter speed, at least one second (a correct exposure is not important this time). The one second just separates the two flashes so that humans can distinguish it as seeing two flashes. TTL mode will see two flashes, one just before shutter opens (preflash), and one at the one second end of shutter duration. Manual flash will only see one flash, at the end of the long shutter duration. i.e., there is no preflash with Manual mode flash. [/QUOTE]

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