already have a lot of filters from K&F and this one fits in perfectly with my collection. The packaging is also nice, I like silver, but the included hand strap is a bit strange. I just couldn't get it to fit onto the lens cap. The fact that a lens cap is included also sets this filter apart from others. And there's not much to say about the quality of the filter if you know K&F. The material and workmanship are great, and the image quality is also flawless. The different price levels at K&F go hand in hand with better coating/coating. The K series is of course inferior to the X series, for example, but it is also a bit cheaper. And for most people the K series will be sufficient, as they are already 18-fold coated, so they also repel water and dirt well, are easy to clean and provide outstanding image quality. It only becomes problematic with very wide-angle lenses, so I think with a focal length of less than 30 mm, where you can see the usual polarization X, but I have not yet come across a CPL filter where this is not the case. The resistance to turning could be a little lower for my taste, adjusting the filter is quite stiff. But that is a matter of taste.