Re: ND or graduated filters
4x or 8x filters will work well when you just need a sunglass for your camera to cut the light level down to a manageable level; something in the range of 1.6 to 2.0 ND (40x to 100x filter factor) will work when you want long exposure times for the silky smooth water effect in landscapes. I tend to dislike this effect myself so I don't have those filters.
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