Well, I see reviews where people complain about how expensive filters are, even ones in this price range. Aside from the fact that you couldn't get filters of this quality 10 years ago (really just because of advances in multi-layer technology), even filters that were close were very expensive, at least for me. The only advantage of the filters being in this high price range is that the mounts are made of brass (and K&F has their top line with even more multi-layer layers and brass rings, I haven't tried that yet). They are nicely milled and have deep knurling on the side, which is nice to use especially with a rotating filter. This particular filter spins very smoothly. I have the same Nano series filter in two other sizes, and the large one, 82mm, spins stiffly. I expect it will loosen up. This particular filter (67mm) is pretty smooth though. So what makes this 5 stars for me? The polarizing film included works as expected and there is very little color cast. While I haven't done a light transmission and reflectivity comparison test with their CPL filters, I have done a pretty extensive comparison with UV filters and the Nano series was in the top tier — again, competing with filters costing up to four times as much. So I'm extrapolating that the coatings on the polarizers are just as effective. 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, there have been a lot of advances in coatings recently. The cap, cleaning cloth and filter holder are just bonuses. However, I would rather take the older, round K&F filter case than the larger box this one came in.

Very much up to the expectations of a K&F filter. Nicely made, thin brass frame. No observed color cast in images nor distortions. Comes well packaged and includes a soft carry case.

I now understand why K&F Concept products are made from brass. It is so resistant to torsional deformation and the screw easily fits filters from different manufacturers. Previously, I bought the "MARUMI Step Up Ring Made in Japan" on Amazon, and there were no problems at the beginning of the purchase, but after repeated use and careful storage, it gradually became unfit. In fact, I was quite impatient because the ND filter didn't fit on the outdoor site. Conclusion! If you're buying a large diameter like 82mm, I think this K&F Concept brass piece is the best because it's strong and sturdy!

We just love this binoculars!

K&F has been making some really fantastic filters lately. The build quality of these devices is excellent. Precision machined brass rings thin enough not to interfere with the image but strong enough to protect your glass. They screw on very easily and the brass prevents unplugging and threading. The optical quality of the glass is excellent. There is no distortion whatsoever and the nebula filter gives your images a very subtle, dreamlike quality. In my opinion something that is really impossible in Photoshop or with digital editing. You get the realism and quality of a real optical effect and these look absolutely gorgeous. Some people may disagree, but I always prefer to do as much as possible in camera to avoid post-processing. And for videos, this is of course a time saver. Applying this subtle fog effect digitally to video is very processor intensive. This is a neat little way to soften facial features a bit for portraits, and I decided to take a portrait of this little guy. You can really see the difference around the eyes that the filter makes, in addition to the fact that it was very bright and this filter helped soften the shadows. This is a 1/4 crap so the effect is very subtle. Don't let the Black Diffusion name confuse you. This filter brightens your images by reducing contrast and softening highlights. It actually brightens the image up a bit, but in a way that doesn't blur. That's the beauty of real optical filters and not digital post-processing effects. This compares to my German filters, which I have paid a lot more money for in the past.

The adapters from K&F, Beschoi and Gobe, which all seem to come from the same source, are of good quality. The second generation of these adapters is made of brass, and is therefore of a higher quality than the first, which used aluminium. The aperture can be easily adjusted, there is no play on the lens side, the adapter sits almost perfectly on the camera.

K&F’s build quality has been second to none in the last several years. They’ve created a series of extremely high-quality filters using very slim precision machined brass rings ( brass is a much better material to use for this purpose than aluminum. It’s much less likely to strip threads or to cross thread) and excellent optical glass.This filter is no exception. It has absolutely no optical distortion whatsoever. It filters UV and pretty much nothing else I think it has about a 99.9% visible light transmission.Most people use UV filters to protect their lenses but it’s also helpful to filter out UV light for photographic reasons. It can help to increase the life of your camera sensor and prevent distortion in the images.The anti-reflection coding on this is extraordinary. This competes well with my expensive high end German filters that cost up to four times as much money.This filter is slim enough that it should not interfere with the image or create any vignetting even with wide-angle lenses.This is my review for the UV filter but honestly every K&F filter I have purchased has been extraordinary.Look at the photo and see if you can tell any difference.

The stand is very useful,