Longer shutter speed.
I recently purchased a 10-stop neutral density filter, this is the first image I took using it. ND filter is like putting sunglass over your lens; it blocks out light. This one filter is very dark. I regret going cheap and getting a screw on filter instead of the slide in type. The filter is so dark that the camera can’t focus, so you focus with the filter off and then try to screw it on the front of your lens without moving anything. The more expensive filter just slides down after you focus.
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