[dylan604]

ND filers slow down the shutter speed which will only increase the motion blur. When shooting in the sunny outdoors, you're going to be using the lowest ISO. The only thing left to control the exposure is the shutter speed. So with a fast shutter and 60fps also decreasing the exposure time the motion blur is going to be reduced as much as one can get.

[Gigachad]

If you're on the lowest iso you could use an ND filter and bump the ISO a little higher giving some room to move up and down the ISO values to match the conditions while keeping the shutter speed fixed. That's kind of the primary function of an ND filter.

For video ideally you want both the shutter speed and aperture fixed since having the depth of field fluctuate in the video isn't ideal either.

[dylan604]

Sounds like someone that is used to running a single camera looking in a specific direction. Try running 6 cameras with one pointing in each direction so that every thing is seen. That's a small rig. Do the same thing 22 cameras running at the same time to make one image. You'll be just fine with allowing the camera to adjust the ISO for you.

I once thought similarly to you are thinking now. I quickly gave that up for the specific type of shooting discussed. You quickly realize that the software in post for stitching is really good at what it does.