Amazon.com : 52mm 850nm Infrared IR Optical Grade IR85 Filter for Camera Lens : Electronics
Amazon.com : NiSi 100X100mm Square Neutral Density Filter,IR ND64(1.8), ND 6 Stops 100mm System Optical Glass for 52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm Lens,Compatible with Lee Cokin Hitech Singh-Ray : Electronics
Amazon.com : Fotga 77mm Six-in-One Adjustable Infrared IR Pass X-Ray Lens Filter 530nm to 650nm 680nm 720nm 750nm : Electronics
Amazon.com : KODAK IR Neutral Density Filter ND16 Filter Stops Overexposure Reduces Depth of Field Captures Motion Reduces Infrared for Color Accuracy, Slim, Nano Multi-Coated 16-Layer Glass w/Mini Guide | 49mm :
Amazon.com : (2 Pcs) 52-72MM Step-Up Ring Adapter, 52mm to 72mm Step Up Filter Ring, 52 mm Male 72 mm Female Stepping Up Ring for DSLR Camera Lens and ND UV CPL