Well, I do see reviews where people complain about how expensive filters are, even ones in this price range. 10 years ago, besides the fact that you couldn’t get filters of this quality (really only because of the advances in multi-coating technology), ones that were close were very expensive, at least to me.

The only advantage the filters that are in that high price bracket have is having the mounts machined from brass (and K&F has their upper tier line with even more multi coat layers and brass rings, that I haven’t tried yet). These are nicely machined, and they have a deep side knurling, that especially on a rotating filter, are nice to use.

This specific filter rotates very smoothly; I do have the same nano series filter in two other sizes, and the big one, 82mm, is stiff to turn. My assumption is it will loosen up. This specific filter (67mm) is quite smooth though.

So, what makes this 5 stars to me? The polarizing film in it works as expected, and there is very little color cast. Although I haven’t done a comparative test on light transmission, and reflectivity with their CPL filters, I did a fairly extensive comparison on UV filters, and the nano series was in the top tier—again, competing with filters that cost up to 4 times as much. So, I’m extrapolating that the coatings are just as effective on the polarizers. To be fair, I should mention that the newest of my “expensive” filters are at least 5 or 6 years old, and, as I said earlier, there’s been a lot of advancements in coatings made recently.

The cap, cleaning cloth and filter keeper are just bonuses. I’d rather get the older, round style K&F filter case rather than the larger box that this came in though.