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this is true, if you have HSS off. if you have it on, i think the flash duration gets locked to whatever your shutter speed is. try it -- take a picture of moving tap water or something at 1/250th with HSS on, and 1/160th with HSS off. you will see motion with HSS on if the shutter speed is low.
D. Diggler wrote:
Not sure I follow all that but you mention a flash duration of 1/250th. My understanding is flash off a speedlight is much faster than that. To my knowledge, a flash at 100% full power will have a duration of around 1/1000th of a second and as the power is cut [say 1/2 power, 1/4 power, etc.] the duration becomes shorter, into the range of 1/5000th or faster.