In my opinion, a UV filter is an absolute must, if only as an insurance policy to protect the lens itself. These are way more effective that those sticky glass protectors, can be removed if needed, and don’t interfere with locking the gimbal like some others. I have many K&F filters for other lenses and they’re always of excellent quality.

First of all, I like K & F concept, and have purchased another UV lens for a different camera. They make good affordable products. I love this lens, more for the protection it provides than the UV filter. I used to use the lens protector that stuck on but then thought it might affect the image quality. I much prefer this add on lens. If I decide to experiment with other kinds of lenses, this one pops on and off. I'm prepared to lose it at least once, and repurchase. The Pocket devices are delicate, not action cams, so it's worth a bit of protection. I had to send the Pocket 2 to the Pocket hospital once so I speak from experience. The added screen protector is a great addition.

It definitely fulfills its task, especially when recording over water. And of course the pocketed completely retracts when turned off, and unfortunately it doesn't, like with a wide-angle lens. I recommend it.

Set and forget. It won’t bother you anymore. It should do the job protecting my lens.

The big advantage of this filter is that it can remain on the lens of the DJI Osmo Pocket 3 because it is very thin. I have had some filters before that I had to take off every time I turned the camera off. This is not the case with this filter. It sits very firmly. The magnet power seems to be sufficient.

Nd looks decent.
Magnet holds very good.

Makes very soft edges around in photos or videos. Specially in hard sun.
Bit annoying,
But overall ok.

This is exactly what I needed to accomplish having the diffusion look with an ND filter using only one product on my Osmo Pocket 3. No need to stack filters. I love it. Only thing I wish were different was that the magnetic attachment was stronger so when adjusting the ND it didn't feel like it was about to fall off. I think they did the best the could under the circumstances and I am impressed. Thank you!

It may not be the best filter on the market compared to the references in the field, but since it is a camera intended to film "quickly and well done"; it is very practical by simply turning the ring until the desired ND index. On the other hand, the white reference point is very small .... The results, even in Auto mode, are very satisfactory.

The ND filter is good and does its job magnetically allowing it to be kept on the nacelle even when turned off being thin but it would have been good to have notches on the adjustment.

After using it for close to a month, I found this to be a budget friendly but very good quality black mist with variable neutral density filter for the DJI pocket 3.
The construction is quite good but not premium. The filter itself is made of glass with multiple coatings. In a month of intermittent "not so carful" use, there was no scratch. The glass filter has a little play in the housing and not quite as snug as I expect. Rotation of the glass filter is also loose without sufficient damping. The filter fits perfectly on the pocket 3 and the magnet holding the filter to the lens is quite strong.
Mist filters have become a popular tool among photographers. The mist effect on this filter is not very strong; there is a soft glow around bright objects, and softening of contrast and texture, which are the intended effects. The neutral density provides up to 5 stop reduction in exposure, useful in high contrast shots or very bright beach scenes. Haven't had the opportunity to try it on snow scenes yet! There is no polarizing filter.
There is no evidence of chromatic aberration.
The filter comes in a large protective case although most DJI pocket users tend to keep their filters in the neat filter slot in the hard case that came with the camera.
A screen protector is included in the package but I did not use it.
All in all, this is a decent black mist filter with a 5-stop neutral density filter that is well built. If you're looking for that black mist effect or need a neutral density filter for the DJI pocket 3 (this will not fit on a pocket 2!), it is a good choice.