I have read a lot about compensating exposure when using polarizers, NDs, etc. On my D7200 I have used as much as a 3-stop ND with a 2-stop ND Grad on top of it and even on auto or A priority the pix come out great (bracketed). Does the D7200 "know" I have these filters on? Is there a point at which it won't? (The (excellent) Mastering the Nikon D7200 book seems to suggest the camera can tell up to six stops but after that I'm on my own. I may be misreading it....). Thanks.