qleak
No longer a newbie, moving up!
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The more concerning relation between flash duration and water drop motion blur is the distinction between t.5 and t.1 duration of the flash.
The stated manufacturer specifications are for a t.5 time which means the flash has reached 50% amplitude by this time. The t.1 time for an sb700 at full power is approximately 1/300 second which is not quite fast enough IMHO. At 1/2 power it's approximately 1/1000 which is certainly fast enough for most situations. At 1/32 and 1/64 the durations are <= 1/8000 second so are at least as fast as any shutter speed.
Here's where I got the measured t.1 times.
The stated manufacturer specifications are for a t.5 time which means the flash has reached 50% amplitude by this time. The t.1 time for an sb700 at full power is approximately 1/300 second which is not quite fast enough IMHO. At 1/2 power it's approximately 1/1000 which is certainly fast enough for most situations. At 1/32 and 1/64 the durations are <= 1/8000 second so are at least as fast as any shutter speed.
Here's where I got the measured t.1 times.