B00009R7W3 LEE Filters 100mm Graduated Neutral Density Hard Edge Filter Set (0.3, 0.6 and 0.9 Filters) 100x150mm

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Allows the transition to be blended into the scene, often imperceptibly
Neutral density 0.6-to-clear, with a two stop differential
Compensates the average bright sky-to-foreground situation
The most popular density of the series
Recommended for wide angle lenses and the hard edge is recommended for normal and longer lenses