Century Optics 4x4" Graduated Soft Edge Neutral Density ND .6, 4x, Filter.
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ND .6 Soft Edge Graduated Filter.... Employs a surface that is 50% clear and 50% with a neutral density of 0.6. The shift from clear to ND is achieved with a SOFT EDGE (SE) transition line.
The ND .6 Soft Edge Graduated Filter balances exposure within a scene for example, the exposure of sky and earth in a landscape, avoiding overexposed blank white skies.