Hama 79177 77mm Variable Neutral Density Filter - Black : Electronics - Amazon.com
Best variable ND filter - Camera Jabber
ProOptic 77mm Variable Neutral Density (VND) Filter - 2 to 8 Stops PRO-FL-77-ND
Amazon.com : NiSi 67mm Swift True Color ND-Vario | 1-5 Stops Variable Neutral Density Filter | Adjustable ND, True-to-Life Color, No Vignetting, Optical Glass with Nano Coating | Photography and Videography : Electronics
Amazon.com : Hama 79177 77mm Variable Neutral Density Filter - Black : Electronics
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ND Filter. Don't go Variable! – jonasrask | photography