I've been a fan of K&F filters and accessories for some time now and have come to appreciate the brand's durability and quality. Most of my lenses live their lives with K&F UV protection filters on the front. Like many others, I've started to focus more energy on taking advantage of these features, not to mention portability, as the quality of mobile phone images and videos has improved to near-professional quality levels. In both videography and photography, whether with a full-size camera or a high-end mobile phone, I find a CPL filter indispensable. It also has the effect of neutral density. In the hand, the K&F Concepts Magnetic Circular Polarizing Filter System gives the impression of quality. Between the matte black finish, the 52mm magnetic adapter ring, and the reflection of the rich multi-coatings, it's an impressive filter. Interestingly, despite the fact that the adapter and filter are magnetically attached, the CPL still rotates freely as needed to adjust the angle. That must be magic. The only disappointment with the system for me is the lack of usable threads on the front of the CPL. I prefer lens hoods and would love a way to attach them. Or to have the option to mount another filter or step-up ring onto the system. However, step-up/down rings with appropriate 52mm thread can be attached to the threaded adapter ring. For example, a 49mm — 52mm step-down ring allows the 52mm CPL to be used on a 49mm threaded lens. On the other hand, the lens I showed in the pictures takes 52mm filters and its built-in sunshade fits well with the 52mm K&F Concept Magnetic System, but the lens' front cap does not. I checked the K&F Concept store and they have a number of other magnetic filters, filter sizes and adapter ring combinations in their magnetic ecosystem, most of which include a magnetically attachable front lens cap, including circular polarizers; why they don't include one with that combination I wouldn't know, but I think they should. The convenience of the system is negated if, to protect the font of my lens, I have to twist out the adapter ring to put it on a lens cap. I didn't notice anywhere in their Amazon store that a compatible magnetic lens cap is sold separately. In my view, a complete system, and I'm not just referring to K&F Concept in this regard, would include magnetically attachable lens caps and lens hoods as part of the ecosystem. Or failing that, the front threads on the attached filter or the corresponding adapter rings that are the same size as the rear threads on the adapter, allowing for a more versatile system and one that would accommodate the screw-on filters currently used by users. In any case, I have full confidence in the quality of K&F Concepts filters and their products in general. They are a reliable company that stands behind their product lines. If you are interested in any magnetic filtration system, including this one, I suggest checking out the K&F Concept Amazon store for all the available options. Enjoy.