I had a lot to think about buying a home ND1000 filter hoya or B + W particularly to avoid, the color drift during long exposures. Finally the price I decided to choose this one and after testing, I have to say I did not see anything shocking in colors! (The poses ranged from 1/10 s to 5 min) By cons, really do not forget to turn off the VR (or IS, VC, OS depending on the brand) of your objectives in case, otherwise you will get fuzzy pictures ...