NiSi 100x100mm Nano IR 減光フィルター ND1000K（6.0）20ストップ ブラックホール

I've been using this filter during golden hour to get those super long exposure cloud streaks, and the 20-stop reduction works perfectly without any weird blue tint. The nano coating makes cleaning off dust a breeze too.

I was worried about color cast with a filter this dense, but the nano coating really keeps colors neutral even during long exposures. Works perfectly with my 100mm holder and no vignetting to speak of.

Finally, a 20-stop ND that adds almost no colour cast — my test shots came out with neutral greys instead of the usual blue or magenta mess. The nano coating made cleaning off a splash of sea spray effortless. For long exposures in bright sunlight, this filter is exactly what I needed.