Hi,
I think it warns about some strobes which have longer duration of
full flash than 1/180 sec. This is easy to find in studio strobes
as most aren't any faster than 1/200 sec, sometimes less.
Obviously, when the strobe flashes for a duration of 1/130 sec at
full power than some of the light gets cut off as the shutter is
open for only a 1/180 sec, resulting in underexposure (how much of
it depends on the strobe, at the graph of its light discharge
compared to time).
Frantisek
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