New Tiffen 4x4" Soft Edge Graduated 0.6 ND Filter Grad ND6 SE Filters 44CGN6S 49383017694 | eBay
Tiffen 4x4 ND6 Filter 2 F-stop Len Neutral Density - BarnDoor Lighting
Tiffen ND 6 graduated Filter
Amazon.com : Polaroid Optics 52mm Neutral Density Filter [ND 0.6] Compatible w/ All Popular Camera Lens Models : Camera Lens Neutral Density Filters : Electronics