B+W 72mm XS-Pro Circular Polarizer Lens Filter by Schneider Optics at B&C Camera
Amazon.com : B + W Circular Polarizer Kaesemann - Standard Mount (F-PRO), HTC, 16 Layers Multi-Resistant Coating, Photography Filter, 77 mm : Electronics
Fstoppers Reviews the B+W XS-Pro Kaesemann High Transmission Circular Polarizer MRC-Nano Filter | Fstoppers
B+W 82mm Basic Circular Polarizer MRC Filter
Amazon.com : B + W 67mm Circular Polarizer Glass Filter : Camera Lens Polarizing Filters : Electronics