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Old 06-04-2019, 01:14 PM   #3
KevinM
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Join Date: Jan 2008
Location: Massachusetts
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As has been noted, flash durations are a lot shorter than flash sych speeds. The biggest issue I see with taking a photo like the one Lloyd posted is headlights. The flash will definitely freeze the train, but the ISO that's required unless you have a ton of flash power will likely get you some headlight blur if you're using a slow shutter, such as 1/250th.

Not being a strobist, I'm just guessing that the answers probably lie in high-speed synch and/or having beaucoup flash power, to keep the ISO down. Speedlights are probably not powerful enough.
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