ND Filter or Stop Down on Exposure Compensation?

[Daniel Browning]

So should I get a ND filter to stop down?

Yes.

If so, what Attenuation Factor should I get?

I find that 0.9 is usually enough to get the shutter speed down to 1/4000 or so.

How about stop down on Exposure Compensation?

That wont do anything if your shutter speed is already as fast as it can go.