Polarizing filter 43 mm. Excellent in terms of screwing / unscrewing. The thread is really well made. I find the polarization excellent, very balanced. Excellent case, quality. The price is worth the product

The excellent selection of lens filters has turned me into a dedicated K&F fanboy. A few weeks ago, I also purchased a camera backpack and a softbox from their extensive range...so far, everything has been top-notch. This polarizing filter fits seamlessly into this chain of experiences. The workmanship is first-class, the coating is high-quality, and the filter can be positioned precisely, even if it feels like it requires a bit more force when turning than older filters...with this product, K&F has finally ascended to the elite of photo accessory providers. Criticism at a very high level - a slight blue tint takes away some of the warmth from the photos, but you can fix that in post with a click. As always...5 stars for the K&F product.

The filter comes very well packaged in a box that can be converted into a picture frame. It is actually stored in a very high-quality leather case with a side "ejection strap," so you don't have to poke your fingers into the filter disc when removing it. The filter and its mechanism are very exquisitely crafted; despite its compact ("Slim") dimensions, the filter thread can be easily screwed in without any scraping noises or frequent attempts to attach it. Once tightened, it can also be loosened again with moderate force, provided the internal thread of the lens is undamaged and of the same high quality. The ridged areas of the inner ring are really helpful here, as you don't slip along the filter! The "glass" of the Nano-X Pro series should be beyond reproach and be among the highest quality in terms of quality and workmanship. Of course, it's generally difficult to check this in detail as a "normal photographer," and it's even more difficult with polarizing filters, but as expected, it doesn't make any obvious mistakes. On the contrary, polarization can be easily adjusted and achieves the expected effects, such as the classic anti-reflective coating of surfaces/glasses or the improvement of the color impression of the sky or water, etc. Conclusion: High-quality, compact CPL filter, which, when used correctly, continues to be helpful in noticeably improving the result of the images, despite modern post-processing methods.

The K&F filter is great because it does exactly what it's supposed to without noticeably altering the image or the colors. The ring rotates smoothly and precisely with a little resistance, which was particularly important to me. I don't see any noticeable difference in the colors in the image. The polarization also works, of course, which makes it easy to reduce reflections on windows or water surfaces. The included little bag protects the lens well from scratches and dents if you're often on the go with a lot of equipment in your camera backpack. I definitely recommend it.

I remember about 10 years ago when filters of this quality were the price of a lens If you have a high resolution camera like 30mp+ and a sharp lens, I def. recommend you to use this filter, the best value I could find!

Very high performance

I've only tested inexpensive filters in the lower price range. I haven't encountered any problems with these filters in the lower focal length range up to 70mm. I've been able to test them myself up to 200mm and get excellent image quality with this filter. I would definitely recommend it.

Spent the remainder of the day yesterday shooting with this cpl filter optimizing both reflections and removal of the aforementioned. This is high quality kit, buy it! You won't be disappointed

It fits perfectly, the rotation is smooth and easy to adjust. The imaging performance is excellent.

Picture quality remains unchanged. Be careful on fitting this to your lens - slight finger tightness / torque only or there is difficulty in unscrewing - and keep undoing and 're tightening' to avoid stiction. On my next fitment, I may try a minute drop of vaseline applied with a cocktail stick to the filter thread to gauge any improvement. Recommended, but be aware. Thank you.