My best guess as to why an ND is an issue would be the fstop range changes, which would probably be true when adding the wide angle attachment. I had not caught that also does not work to follow something over snow. That's kind of funny given I live in North Pole, Alaska. I'll try it out, regardless since our sun remains pretty low and our snow is often in shade when surrounded by forest. Apparently it's a different sun than the one used by people in the deep south, like North Dakota....so I have hope LOL.