This magnetic phone lens filter clip comes in its own storage case,
It’s appears to be made very well, no plasticy parts all metal.
The ND filter density is variable from ND2- ND32 so there is a fair amount of scope.
Other styles of magnetic filters are made by this manufacturer so this makes this a very versatile kit.
The fitting of the clip doesn’t fit that well to my phone case, now this might be down to the style of case I have, (see photo) when I removed the case and attached the clip it fitted like a glove.
I might purchase a cheap phone skin to see if clip fits as it should, if it does I’m gonna buy the CPL filter for this clip.

K&F Concept are producing some quality ND filter, especially this variable ND filter which has a 2 to 400 stops. There are clearly marked stops on the filter itself, however these are not hard stops which means you can go past the limits to produce "unwanted" effects like purple hazing and hues. At this point there is some X light leaking, but if you do not go past the marked stops there is no issue. This is primarily made as a clip on filter for mobile phones, but there's nothing to stop you from removing the filter from the clip and putting it on a 52mm lens.

The image quality looks clear and and colour clarity looks good, even towards the edges. However, you'll need to put your phone's camera in manual mode for this be just effective, especially on very bright days.

I would've liked a carry pouch or ND filter lid, however for this price and quality this is good value for money.

I was excited to try this variable ND from K&F Concepts as they make fantastic products

This one comes in a plastic case with a little cleaning wipe (nice touch K&F Concepts).

Taking it out of the case it’s a second to clip onto your phone and then a short time just to make sure you have it right over the camera lens correctly (which is easy, just move it around) so that you don’t get any of the filter edges showing

Once in place you just turn the filter until your chosen effect is reached

For me it’s easy : on a bright sunny day just set your phone video setting to 24fps and shutter speed to 48 or 50 and then put the filter on, turn to max and then just turn it until your video image looks perfect - a two second job and perfect results every time

The fact that the filter has a 52mm thread is amazing as it means I can take it off the clip and put it onto my mirrorless camera lenses too! So I can use this on my phone AND my big camera

Great results, easy peasy to use, and real value for money as you can use it on all your cameras!

Love it

My experience: The magnetic attachment of the ND filter is extremely user-friendly. Attaching and removing the filter is quick and easy. When recording videos, the ND2-32 filter helps to better control the light, which leads to more uniform and professional results. The usual workmanship quality of K&F Concept is also evident here: The glass is high quality and the colors are vivid.

Advantages:

Easy to use and the included storage bag and cleaning cloth make the set ideal for on the go.

Disadvantages:
Inconvenient clip: The clip covers some functions on the screen, which limits operation somewhat.
Clip could be more stable: Although the clip works well, a more robust design would be desirable to provide more stability in hectic situations.

The K&F Concept Magnetic Variable ND Filter offers a convenient way to control light for smartphone photography. While it has some strengths, it also comes with a few limitations.

Key Features:

Magnetic Convenience: The magnetic attachment system makes it quick and easy to apply and remove the filter.
Variable ND Range: The ND2-32 filter provides a decent range of light reduction for various shooting conditions.
Phone Compatibility: Designed to work with popular iPhone models, offering versatility for smartphone photographers.
Room for Improvement:

Image Quality Concerns: Some users have reported noticeable image quality issues, such as color shifts or vignetting, especially at the filter's extremes.
Filter Thickness: The filter adds bulk to your phone setup, which can be inconvenient for some users.

Overall:

The K&F Concept Magnetic Variable ND Filter is a decent option for smartphone photographers looking to experiment with light control. While the magnetic system is convenient, the potential image quality issues and added bulk prevent it from earning a full five-star rating. If you're willing to accept these limitations, the filter can be a useful tool for your mobile photography kit.

This is the best ND solution I have found. I am using an iPhone 11. The filter attaches easily and the clip is firm. The filter is so easy to adjust and I cannot fault its operation.

I own a cheap clip on ND filter for my smartphone. It's rather flimsy, the lens size is not standard, and the filter is not variable, so I can't really fine tune the lighting for the perfect amount of motion blur if the light doesn't match the fixed ND filter. This one has so many features I was looking for. First, it's a more standard size of 67mm. Secondly, and probably my favorite feature, is that it's magnetic. No need to screw the filter on or off. It just sticks into place. And thirdly, I wanted an ND filter that was variable so I could set it for when there's an overcast day all the way to a super bright summer day. Overall I like this kit. It does exactly what I was hoping for.

The K&F Concept “Phone Lens Filter Kit, Phone Clip with Magnetic Adapter Ring/Cold Shoe/Locking Knob, Polarizer Filter for iPhone 15 Pro Max 14 13” is a quality filter great for reducing glare. The clip is less user-friendly. I was hoping for something that I could quickly put on my phone and then take off. This clip works, but it is not quick to install.