<p>I received Rokunar CPL filter as an when I purchased extra gift when I purchased B+W XS-Pro HTM KSM Circular Polarizer.<br>
I test with B+W. The build quality: B+W is fine and thinner. The quality is reasonably good in use. I do not see any significant difference in image quality in family use. I did not test it for landscape. B+W is more smooth and gradual change. Rokunar CPL did good job surprisingly. </p>