If you've ever tried to stack an ND filter and a circular polarizer, you know that it is a giant pain and usually results in a dramatic dip in image quality.

A useful workaround is to stack a normal and inverted polarizer on your lens to try to cross polarize the light coming in. It can work well, but can also be more of a pain to deal with than it is worth.

This dual filter is an amazing combo of the two most commonly used filters - the ND and the circular polarizer. Through some sort of witchcraft, they've found a way to combine both filters into one easy to use design. You can do the circular polarize and ND filter to get those beautiful images.

There is no distortion or X pattern. Color shift is minor and is on par with other high end ND filters.

I like the textured rings and heavy knob for adjustments.

I wish there was a way to have no ND filter as an option - so I could leave it on the lens all the time as a circular polarizer and then apply the ND as needed. It's not a huge deal, but would still be an awesome feature.

Great value!

I like my K&F Concept 58mm Magnetic Circular Polarizer Lens Filter. It fits well magnetically or screwed on. The quality of the filter is very good. It also comes with a lens cap safely stored to protect it when not in use.

K&F Concept 52mm Circular Polarizer Filter with Lens Cap Cleaning Cloth Is well made and easy to use. Feels very durable but light weight. It looks good on my camera set up. It’s a great product for the money.

I purchased this 82mm circular polarizing filter to use with both my Sigme 24-70 f/2.8 E mount and my Canon 24-70 f/2.8L II lenses. It's just a perfect polarizer for these versatile zooms.

The lens is extremely well made and the circular effect is smooth as silk when attached to the lens. The high-quality multi-coating ensures details in photos and videos without artefacts or haze and ensures excellent focus accuracy.

Polarizing filters have many uses, including deepening the color enhancements of skies and landscapes, especially in bright light conditions. In addition, the circular settings can be used to shoot through windows clearly and without reflection, and to take pictures or videos through water. For example, this filter can be used to capture perfect images of Koi (Japanese Colorful Carp) in a pond without light bouncing off the water's surface. There are other uses as well.

To operate, all that is required is to point a camera at the subject and rotate the outer plane of the filter until the desired effect is visible through the viewfinder... or on a screen. Easy peasy.

I own a number of K&F filters of various types including UV, ND and diffusers. I trust the company's products. This is excellent value for money compared to much more expensive polarizing filters such as those from B+W and Hoya while offering virtually equivalent performance. Fantastic!

It's an unequivocally high FIVE STARS from me, along with my honest and very warm recommendation. Improve your photography and vlogging! get this!

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I got this K&F Circular Polarizer Filter mainly as a lens cover to protect against dust and dirt to avoid scratching or scuffing the surface of my lens during shooting and it did a really good job in that role! On top of that, this has the added benefit of being a circular polarizer, which really does have a nice effect to remove reflections from the captured image!

Combining an ND filter and a Circular Polarizer in one filter is such a helpful filter, there's almost no reason to remove this from my lens, unless I am shooting indoors. Having both in one filter and being able to dial both in separately is such a good tool and accessory, it is really amazing for using when shooting outdoors in bright sunlight, for being able to lower the f-stop to get my aperture low and get those wonderfully creamy blurry backgrounds, and also dialing in the reflections off of the water, or enhancing the skies. This filter is quite a bit larger than most, and is definitely not a small thin filter, but the glass is great quality, and the threads are machined perfectly. I have no complaints about this filter at all and am really happy I decided to order it. It will get a lot of use from now on.

"Every lens should be equipped with a high-quality UV filter for protection. This 52mm Nano-X circular polarizer filter and MC UV protection filter kit from K & F Concept has such a filter. The kit also includes a circular polarizer filter and 2 high-quality lens caps. The 52mm UV filter has found its permanent place in my Canon EF-M 55-200mm STM lens with image stabilization, and the circular polarizing filter will serve as a welcome extra for several other lenses so I don't have to play "switch filters" between them. The included lens caps are very nice, but I find that it sometimes takes a bit too long to remove them, and I prefer the clip-on style that can be removed instantly.
Both filters improve image quality by removing glare and haze, respectively."

K&F Concept’s Magnetic Lens Filter Kit, which includes a UV filter, a circular polarizer, and a neutral density filter, along with an adapter ring, is a good concept that isn’t quite executed correctly. The idea behind a magnetic lens filter kit is a good one, as it’s never fun to fumble around changing filters when you are trying to get a photo, especially if you are hiking and not in a position to lay down the camera on a clean surface and carefully remove and replace filters. I tested this kit with the Nikkor Z 24mm-200mm lens, which takes 67mm filters, and removed the existing UV filter I had on the camera. The adapter screws on fine, but now with the K&F Concept adapter on the lens, the lens cap falls off easily. The situation improved slightly with the addition of the K&F circular polarizer on the adapter, but the cap still did not stay in place. I even tried keeping my original UV filter on the lens, along with the adapter and then the circular polarizer, and the situation did improve a bit, but I don’t like having a double layer of glass in front of the lens element. I also tried the adapter with an F mount lens with a 67mm diameter, and the result was a little better as F mount lenses have different lens caps. The filters themselves work well and seem to be of good quality. Included with this review is a photo taken with the circular polarizer. The filters themselves are very thin, which is perhaps why the lens cap does not stay on, and the movement of the circular polarizer is smooth. The filters come with a nice carrying case as well. Bottom line, I like the concept of magnetic filters, but, at least with the Z mount 24mm-200mm lens, the adapter and filters are too shallow for the lens cap.