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Comments about Tiffen Tiffen 72mm Digital HT 4x (0.6) Neutral Density Glass Filter:
This 4X neutral density filter is somewhat weak to use capturing fogs or waterfalls on the bright day. So I recommend you to use it with polarize filter or one more netural density filters which you can make really slow shutter speed up to 3 to 8 stops more... I got 16X when I bought 4X from Adorama which seems good combination I guess!