K&F has certainly made a name for itself for high-quality, yet affordable photo accessories. This filter isn't exactly cheap; it's more of a high-end product, which is evident from the fact that it comes with their high-quality filter pouch, and a sealed cleaning cloth is included as standard. I ordered the filter for a 52 mm thread to use on my portrait lens. However, it's surprising that this small filter comes with the large filter pouch. This isn't very well thought out, and I prefer smaller packaging. However, I usually keep a polarizing filter on my lens, which is why I would have preferred to do without the filter pouch. The filter thread is very clean and screws on easily. I can also attach the lens hood easily. I don't find the filter particularly thin, even though it's called a slim filter, but that's not a problem given the longer focal length. More important is the image quality, and it's truly impressive, as you can see from this product's Pro line. The filter's performance is good, clearly reducing reflections without compromising sharpness. Color isn't distorted either, although this can be corrected later when shooting in RAW format.