Just been looking through my menu and came across this; Auto slow sync .................. what is it?
My guess is that it will be explained in your camera manual.
^this.
Why the need to reply, 2 days later, quoting someone else, when the answer (succinctly explained btw, probably unlike the manual) has been posted?
Don't you tend to put "see post # 3" if the answer has already been posted (at least you tend to if YOU have posted the answer first)
It's a means to measure how many people agree with that opinion or not.