The K&F Concept Circular Polarizer and Neutral Density Filter offers the convenience of two quality useful filters in one, at a reasonable price.

The neutral density filter provides between 2 to 6 stops of light reduction, more than enough when wanting to slow your shutter speed for video or specific type of photography, like waterfalls.
Similarly, the circular polarizer removes glare and enhances color and contrast.

Although the filter did not come with instructions, using it is easy, and the outer rim of the filter is clearly marked to indicate the amount of light reduction. Turning clockwise changes ND levels, and counter clockwise is the circular polarizer.

The rotation of both the ND filter and circular polarizer is smooth and even, and the frame, which is made of aluminum alloy, is well-machined and screws easily into the lens. Overall, the filter appears very well made and it even comes in a very nice (leather looking) carrying case.

Bottom line, this is a very useful and convenient filter to have in your kit. Content creators of all types, video and photos, will appreciate the ability to reduce light for video and different types of photography, and increase contrast and color vibrancy.

Highly recommended!

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.

55mm Circular Polarizers Filter, K&F Concept 55MM Circular Polarizer
I've only used this pola a little bit. It is well made and the knurled ring is easy to smoothly adjust.
Only two nit-pics -- There is not mark on the filter to indicate the maximum effect, and the very sturdy rings interfered with the filter mount on the lens. This is not enough to make me regret buying this pola filter.

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.

I started photography back in the film days, when digital post processing was not an option. Consequently, filters were a must. I have always had circular polarizers available for all of my landscape and outdoor work
glass. The K & F Concepts CP is relatively expensive, but why buy high end lenses and skimp on the filters?
The packaging and presentation is befitting the high quality glass enclosed. This filter is simply the best quality polarizer I have used to date. I highly recommend this item, it is worth the price, and you will not be disappointed.

I started photography back in the film days, when digital post processing was not an option. Consequently, filters were a must. I have always had circular polarizers available for all of my landscape and outdoor workglass. The K & F Concepts CP is relatively expensive, but why buy high end lenses and skimp on the filters?The packaging and presentation is befitting the high quality glass enclosed. This filter is simply the best quality polarizer I have used to date. I highly recommend this item, it is worth the price, and you will not be disappointed.

Perfect for all of photographic needs when a circular polarizer is need. Great quality and reasonably priced.

One of the best things you can do to improve the quality of your photos and videos from a drone is to add some filters. In bright light, neutral density filters will speed up your shutter speed. This allows you to achieve longer photo exposures and more natural-looking motion in videos.

The circular polarizer that I use the most on my DJI Mini 3 pro is the circular polarizer. After installing the filter, I point the drone in the main direction I want to shoot and rotate the polarizer to get the best result.

The filters are easy to install and remove. Place the "dots" on the mount against the back of the camera and slide the filter lens over the camera lens. The filters are very light and do not interfere with the movement of the gimbal.

I have used filters from this brand on my DSLR so I was not surprised by the high quality of these filters.