The Genus ND Fader provides one filter that generates 2 to 8 stops (ND .6 to over ND 2.0) of neutral density depending on how the filter is rotated. It is indexed for easy reference and repeatable setups. Fits - Canon 24-105mm - Canon 24-70mm -
Canon 70-200mm. http://www.genustech.tv/filters/genus-nd-fader-filter-77mm.html
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