Originally posted by Culture Can you elaborate more on the various scenarios you have mentioned above?
Of course.
The main advantage of a higher sync speed is to be able to make less light enter the lens without changing the aperture.
It is mainly useful in strong light conditions, like daylight, and when you do want a large(r) aperture in order to reduce DoF.
Now you have other methods to reduce light, apart from changing the aperture & the shutter speed: first one is lowering the ISO.
There is 1/3 of a stop between ISO 100 and ISO 80, so an ISO80-capable camera would allow you to use this in order to reduce light gathered by the sensor, and get by with a higher shutter speed in strong light.
As for ND filters, you can reduce light gathered by stopping it before it enters the lens. You can use ND filters up to 10-stop, or even variable ones. They might be a little pricey, but they're very useful, even when you don't use a flash.
In those situations where you want to achieve defocus (using a large aperture, say f/2.8 or f/4) in strong daylight
and fill shadows with a flash, then neither ISO nor a half-stop faster sync speed is going to save you.
Since we could be talking about 4-5 stops here, you're left with HSS or an ND filter.
HSS is sure convenient, but not all flash units support it.
You might argue that all the techniques above rob flash of some strength, and you're forced to raise flash power to compensate, but so does HSS.
I hope it's clear enough!