B+W 77mm XS-Pro HTC Kaesemann Polarizer

[State of counterfeits in December 2021 and how to completely avoid them] _______________________________________________________________________________________________ This is an extremely high quality, Brass filter. All version of it are Brass. Using it for the past few days I have seen Zero issues with image sharpness at all, vignetting or distortion. Its heavy, Solid and extremely smooth to turn. However, I have noticed that when using this on a step up ring (52mm lens to 58mm filter) the step up ring makes it slightly harder to turn at specific points. However, that probably say more about the step up ring than this filter. The F-Pro version reduces about 1 and 1/3rd stops of light. So you can use this as a 1 stop ND filter too. Other than that the color is amazing, Polarization is amazing and I am extremely happy I paid premium for this over a $20 filter. _______________________________________________________________________________________________ When it comes to counterfeits. I'd like to point something out for those who are worried. If you look at all the reviews submitted through Amazon concerning B+W Counterfeit filters. All of them. And I mean all of them going back almost a decade, are Always related to the XS-PRO (Slim Mount) version. Not the F-Pro version. If you are looking to avoid counterfeit B+W filters on Amazon get the F-Pro version. There are no documented cases of counterfeit F-Pro. B+W also has an authenticity checker on their website. Google "Schneider Kreuznach authenticity check". Keep in mind the country you bought the filter from Amazon on for the authenticity check country. If you purchased from .De Amazon, select Germany. If you purchased from .co.uk select UK. If you purchased from Amazon US select US etc. You won't regret spending money on a quality filter like this.