What is high speed sync

[TCampbell]

He didn't mention it in the video (great video, btw), but the max flash power when using high-speed sync can also depend on the shutter speed.

For example... if the flash has to pulse four times as the curtains sweep across the image then it cuts the max flash power to 1/4 of what the flash could fire if it were allowed to use full power. But if you use a faster shutter speed, the slit narrows and this means more pulses of light will be required. E.g. double the speed and maybe it now requires 8 pulses of light instead of 4 -- and the max flash power is now cut to just 1/8th of full. The camera can calculate the number of pulses it will need and adjusts the max power accordingly.

 

[Rampage]

Watch this video it should explain clearly what highspeed sync is as well as a few other flash functions

Good looking out with that video. It explains the concepts very well

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