have worked with a number of K&F Concept products, including some of their other filters and I have come to recognize them as an inexpensive brand with mid-range products. I have a lens with a 62mm thread size and more than once I wish I had a CPL for it. Now I have one that fits it and I am very pleased with it. If you are looking at this product and reading reviews, you already know why a CPL filter is important - in a very concise summary, it cuts reflections. Some are more effective than others and some are garbage. This one works well enough for my purposes. I often need one of these for dealing with reflections on either water or windows. Depending on how directly the light source shines on either of those surfaces determines how well it cuts out reflections. The more direct the reflection of the actual light source, the less effective a job the filter does. It seems to work on par with or somewhat better than other inexpensive filters I have used with other lenses - it cuts most of the reflections. It is not perfect but it works well enough. The amount of filtering is variable and the outer glass can be rotated to increase or decrease the amount of filtering. This is a standard feature. The rotation is smooth and I haven't felt any catches or grinding as I turn it. This is an inexpensive CPL filter with mid-range performance. If this was more expensive I would expect better performance, but for the cost I am more than pleased with it.