So I took these photos with my iPhone 13 Pro Max. The first photo is with no filter and then progresses from ND2 to ND32. I did not further alter these photos in anyway, it is just what my camera automatically adjusts to. I do think the colors and details are a bit more vibrant in the photos with the filters.

What I also love about this set of filters is that the design works with a case. I have a case on my phone and I did not have to take my case off to use this. The magnetic design is also great if you want to be able to take off or put on the filter really fast. I've seen some designs where you have a separate filter for each ND, this is just all in one.

This is K&F Concept 24-layer coating, ultra low reflectivity 0.4% and anti-glare UV filter, better specs than the budget ones. Actually, I can't tell the difference with their cheaper similar models for my grandchild's photos. Of course the difference is there, so I use it for my most expensive f1.2/1.4 prime lenses. Maybe a thousand dollar lens should have a more expensive UV filter for some people.

The K&F Concept 55MM Polarizing Filter is a quality addition to my photography gear. The ultra-thin design and multi-coated Japan optics provide excellent clarity and reduce glare effectively. It comes with a lens cap, which is a nice bonus. The Nano K series lives up to its reputation and improves the colors and contrast of my photos. This polarizing filter is a great investment for any photographer looking to improve their shots.

I am very impressed with the quality of the materials this device is made of, it is metal, of good quality, it feels and works like something really durable. I mean, it is not an electronic device, but once you have it in your hand, you know you made a good purchase. I used it this weekend with my iPhone 13 Pro to record some videos and the filter helped me a lot to almost completely eliminate the glare from the sun and the reflections from the windows of the vehicles and the surface of the sea.
With the included filter, the sky takes on a more intense blue tone that greatly increases the contrast of the photos and videos. If you have used a polarized filter, you know what I am talking about.
I have only tried it on the iPhone 13 pro, and it fits this model of phone perfectly. It is appreciated that it comes with a hard case and a cloth to clean the filter and the adapter as such.
Very good and recommended.

A great filter, ultra-slim design makes this filter easy to carry, and it does not add any significant bulk to my bag. The filter rotates freely and feels well-constructed.

I have this ultra-low reflection uv filter in three sizes! It is very well made, easily threads on the lens, and provides great UV protection as well as preventing my actual lens from being scratched. Great value for the price! Picture quality is great through the filter. I use this filter for everything outdoors.

I needed an ultra-thin UV filter for my wide angle lens and this filter works great! I was still able to screw in the lens hood and not get any vignette in the corners. This filter also seems to alleviate some of the glare I experienced. The surface of the filter is super clear and doesn't interfere with my camera's autofocus. We recommend.

In my opinion this is a very nice black fog camera filter for my DSLR. It is made of high-quality optical glass with multiple layers of ultra-thin nanometer coatings and ultra-lightweight materials. The frame is very light and thin compared to some other filters I have. This filter is a 1/4 diffusion/fog filter and the changes from a regular, unfiltered lens are minimal. The same filter is available in smaller and larger strengths. But I figured 1/4 would be a good place to start experimenting and for general use. The price of this filter is very good considering you are getting a high quality multi-coated glass filter. From my various experimental shots, I believe this filter has a lot of potential for portraits and still lifes. I'd like to try it on more macro shots as well. I would definitely recommend this camera filter to anyone who is still shooting with a DSLR rather than their phone. ;-)