CP filter Rotated 180* you can see the color of the skies appear deeper blue. $5 dollars at the pawn shop.
GND filter soft edge. $15 at the pawn shop.
As I digging out my old photos from Arizona trip, I remember that I did some test shoots on three diffrent filters at this location. These photos are unedited, and it was on A mode at f/32 Nikon D3 24-70mm f/2.8 lens.