Amazon.com : 72mm Variable Neutral Density NDX Filter for Sony SLT-A37 : Electronics
Platinum™ 72mm and 77mm Variable Neutral Density (ND) Lens Filter PT-MC400VND77 - Best Buy
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NiSi 72mm Nano IR Neutral Density Filter ND1000 (3.0) 10 Stop | NiSi Optics USA
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Amazon.com : NiSi 72mm 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
K&F Concept 72mm Fader Variable Neutral Density Lens Filter ND2 - ND32 NO X Spot | eBay
Platinum™ 72mm and 77mm Variable Neutral Density (ND) Lens Filter PT-MC400VND77 - Best Buy