Hi everyone, I've recently been playing around with some newly-bought ND/ND grad cokin filters (P-series), and I find it's impossible to overlook the pink/purple cast that appears on all shots, very extreme when the filters are stacked. Why does anyone ever buy these filters when they ruin all shots like this?? And why is it that you only hear people complaining about it quite infrequently? Looks like I'm gonna have to invest in a more expensive system...