B005QAGRB0 Kenko KEENDXV77 77 mm Variable NDX with Step Ring Filter

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The Kenko NDX filter can be adjusted from ND2.5 to ND1000.
The filter can darken the scene by anywhere from 1.3 to 10 EV.
The filter allows the use of wide apertures while keeping the correct exposure within the shutter speed range of your camera.