The closeups of Vader in Rogue One were surprising to me because I noticed the helmet lenses seemed noticeably amber. (I'm using this image because the color is the most obvious. And, being licensed merchandise, the color must have been chosen deliberately)
Here's another:
Whereas in Revenge of the Sith, we also have extreme closeups, but I believe the lenses are meant to be the same as the rest of the helmet.
Was the depiction indeed inconsistent? Was it black in Episodes 3-6? And if so, which color is it really?