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buttin in to say i really like Formatt HiTech!

I do not have as many filters to give advice on brand, but from what I used to call it. I shoot with a filter Hoya ND1000, this is a good filter with a constant density, in my opinion an excellent solution for shooting at long exposures during the daytime. I tried to shoot with a variable filter, but he gave a cross-like pattern and did not go to my camera.