B + W 67mm XS-Pro Digital Nano MRC Clear #007 Filter #66-1066109 - Newegg.com
67mm Black Mist Filter 1/4 Special Effects Filter
B+W 67mm XS-Pro Clear Nano MRC 007M Filter
Sigma 35mm f/1.4 DG HSM ART Lens for Canon EF - Bundle With Haida 67mm NanoPro MC Circular Polarizer Filter, Haida 67mm NanoPro MC Clear Filter, Clean - Walmart.com
Used B+W 67mm Clear MRC 007M Filter 66-1001703 B&H Photo Video