Amazon.com : High Definition 77mm 10-Stop NDX Neutral Density Variable Filter for Sony 24-70mm f/2.8 Carl Zeiss Vario Sonnar T Zoom Lens & Sony 24-70mm F/2.8-22 Wide-Angle Lens : Electronics
Ice 77mm ND1000 Solid Neutral Density 3.0 Filter ICE-ND1000-77
NiSi 77mm Nano IR Neutral Density Filter ND1000 (3.0) 10 Stop | NiSi Optics USA