First the good. This is a well machined and properly threaded magnetic ring with a multi-coat, optically clear polarized filter. The filter rotates easily to find optimal polarization. Results are as expected when taking pictures in the right conditions. Darker, richer blue skies especially in typical landscape shots. The magnetic ring allows for quick exchange with other filters or stacking of multiple filters.

My issue is that my standard lens cap for a Sony 24-105 F4 G OSS lens does not work on either the filter sitting inside the magnetic ring or on the magnetic ring itself. I get it. It is a kit that needs a K&F cap.

Now it gets interesting. Search on Amazon for just the lens cap that fits the CPL? That lens cap is pictured on other listings and has a red ring and red logo on the outside. That cap seems to come with a three-piece kit with the magnetic ring and a filter or a two-piece kit with the filter and cap. I looked on both Amazon and K&F Concept. No lens cap as a standalone purchase?

This means that you have to spend additional money on a two-piece set with an additional filter and the lens cap or a three-piece set with the magnetic ring and filter to get the lens cap. Really? It makes little sense to have a two-piece kit that only includes a magnetic ring and filter, especially if this is your first K&F set. Bottom line? Be sure to order the set with a lens cap if it is important to you. 5/5 for optical clarity and filter functionality. No lens cap? I need one. Disappointed. So, minus a star. 4/5.