Originally posted by falconeye Ok, I hope I am not brain dead but I think I contradict.
I wouldn't suspect "brain dead" but perhaps posting too late at night?
Originally posted by falconeye For flash the thing is to overpower the sun.
That's a secondary concern, though.
First one has to avoid overexposure due to the ambient light. Once one hits the sync-speed, the only standard camera-based options for avoiding overexposure are decreasing ISO or stopping down the aperture.
Often one does not want to stop down the aperture since a shallow DOF aesthetic is aimed at or too high an f-ratio would have undesired diffraction related effects.
Originally posted by falconeye Lowering iso or aperture doesn't help here, lowering shutter does.
I don't understand what you intend to achieve by lowering the shutter speed. In my application scenario, the sync-speed is an upper limit one would like to break, i.e., one would like to increase the shutter speed but cannot (unless one resorts to HSS).
Originally posted by falconeye Where it does help though is with shallow DoF at sync speed and at sun light.
Yes, that's the main application I was referring to.
For this purpose, a built-in ND filter option would do the same trick, as one really does not need more DR, just an option to deal with an oversupply of photons (without stopping down). Using ND filters on lenses -- instead of a camera-based one -- is of course an option but there are many practical issues associated with their use.