A very well constructed and very complete filter since in the same ring you have both the ND filter and the polarizer and a little bit of MIST included.

I'll tell you, the last 2 photos are a clear example of how this polarizer works, if you look at the window you can see perfectly how the reflection produced by the light itself and the glass is eliminated, being able to see almost inside what is there.

And in the video I explain quite well with example how this polarizer works, which for those who don't know photography is like putting on sunglasses yourself and seeing everything better on a very sunny day, that's how ND filters work.

It is threaded and attaches very well, although I have to say that I had a small mishap since I screwed it to a Nisi UV filter and I haven't been able to release them yet so now they both come in a pack together haha.

I really like how it works and it will come in handy for long exposure in the middle of the day and be able to give that silky effect both in water and in clouds, for example, in addition to removing reflections and being able to see the full texture.

These guys from KyF Concept work very well and are not expensive at all. Highly recommended for my Sony 18-105 lens with a diameter of 77mm.