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Published on Mar 6, 2013
A Sony HVL-F58AM Flash gun, set to 1/32 power, HSS on (DSLR set to 1/400 s exposure) recorded in super slow motion at 500,000 frames/second. Played back at 25 FPS, the video above shows the firing slowed down 20,000x.
The pulsing used to enable the high speed syncing can clearly be seen.