Dave Dugdale is a good friend and always does fantastic comparison videos. Check out his latest one on Fader ND filters here:
In this episode I show an invaluable tool to protect your fader ND, keep unwanted light out of the lens, and a way to keep from accidentally adjusting your fader ND.
In this episode I talk about using the Light Craft Fader ND to control Exposure and show examples between using the filter out doors vs. using aperture to stop down exposure:
Fader ND by Light Craft Workshop. This is a must have tool for anyone using DSLRs outdoors or in intense lighting conditions.