pyrojim wrote in post #14739737
At what minimum speed do modern canon cameras need high speed sync?
I believe today's Canon DSLRs have X-sync speeds in the range of 1/200 to 1/300. You need HSS to go beyond that.
Now, high speed sync does not offer motion stopping in and of it self..... the shutter speed you would use it at CERTAINLY would qualify.
Highspeed sync is a great tool. Once I figured out that the 430ex could go into HSS mode, I loved using flash in bright sunlight.
Nothing wrong with that, as long as you
a) pay attention to the distance scale
b) wait for the extended recycle time
c) prepare for the reduced battery life
The catch-22 in this whole equation is that the motion-stopping ability of a faster shutter really isn't needed with portraits. It's useful when shooting sports, but when shooting sports the subject is usually beyond the reduced range of HSS flash.
Of course there are exceptions and specialized uses, which is why I didn't say HSS was worthless, I just said its utility is limited.