Polarizing filters test - B+W KSM C-POL MRC 72 mm - LensTip.com
Amazon.com : B+W 77mm Master High Transmission Kaesemann Circular Polarizer MRC Nano Glass Filter & Clear Protection Filter for Camera Lens – Ultra Slim Titan Mount (T-PRO), 007, HTC, Photography Filter, 77
Amazon.com : B + W Circular Polarizer Kaesemann - Standard Mount (F-PRO), HTC, 16 Layers Multi-Resistant Coating, Photography Filter, 58 mm : Electronics