Review on Tiffen 77mm Neutral Density 0.9 Filter: Enhance Photography with Superior Light Control by Dube Jansen

Does what it's supposed to - cuts three stops of light. The thread, although aluminum, is good, the lightest of all my filters (B+W, Hoya and Tiffen) are screwed in. However, it adds a cool tint to the images that I don't like at all. It's fixable, but not that easy - it truncates different channels to varying degrees and can be adjusted to PITA in post, especially for video. It also dazzles quite a bit despite the coating. In general, I prefer my black and white filter's tint, which gives a warm color cast (also hard to fix, but much easier to manage).