Thanks to all who responded to my dirty sensor issue..
so i will have to learn how to clean my sensor , thanks for all the links supplied
The purple tint is probably from your ND filter
oh yeah its def. the nd .. i just meant i never noticed it so much when i used on the 5d3 , they were pretty pricey and i only spent that much as they had good reviews especially for not leaving any sort of color cast
possibly w/b adjustment can even things out .. i dont know not really well experienced with ND's .. i just started messing with them so i can do some daytime long exposure