haha, I didn't notice that the sun was blocked by cloud in the left pic, but right pic got the sun
so actually the light condition already changed, hence cause the NDx400 not 400x anymore
and ya, the wb already shifted and cannot tell the color tone diff is caused by the filter (at least not 100%)
NDx400 should not change the colour tone. Since the lighting has changed, it could have the AWB changed too.
I guess this filter is good for ppl who shoot landscapes and cityscapes. I shoot people primarily, therefore, this is not 1 filter that I would use frequently enough to buy.
BC