Seem to be a good quality !

Capturing life's fleeting moments has never been easier, thanks to K&F Concept's ingenious phone lens filter kit. From the moment I slid that magnetic adapter onto my iPhone, I knew this was a game-changer in the realm of mobile photography.
The variable ND filter is a true gem, allowing me to effortlessly control light exposure and achieve those silky-smooth long exposures that bring motion to life. Whether it's freezing the crashing waves or blurring the bustling city streets, this filter has become my trusty companion. The cold shoe mount and locking knob ensure a secure fit, preventing any unwanted lens shifts mid-shot. While the magnetic attachment can be a tad finicky at times, the convenience it offers far outweighs any minor hiccups. With K&F Concept's filter kit, my iPhone has undergone a transformation, elevating it from a mere snapshot-taker to a powerful creative tool that captures the world through a truly unique lens.

This piece is amazing and just what you need to complete your iphone rig. I love the rubber pad to ensure your screen is unharmed when using. The ND filter is great and glides like a dream with the adjustable dial.

The description for this K&F Concept Clip says "[Widely Compatibility] The clip can be clamped on most smartphones"

I have a Samsung A51 (the older 4G model) with an otterbox case. There was no way to attach this without removing my otterbox case. Note that I have another phone lens ND filter with a clip instead of this screw mechanism which is able to attach with no problems with or without the otterbox. Speaking of without the otterbox, my phone was too thin for the clamp, having the same problem as the next device I tried it on below.

So I tried it on my Samsung Galaxy Tab S9. I don't have a case on it. Again, no luck. my tablet is too thin. The screw mount pad, when fully tightened, still doesn't touch the screen with almost a 1/4 inch gap remaining. I might be able to get this to work with a felt furniture slider pad, but that is not ideal.

Finally, I tried it on my Pixel 6. Surprisingly, I could get it to fit even with the case still on. I thought the Pixel camera bump would not work with this, but it is ok(though not an ideal fit).

So in summary, unless you have an iphone that they list, you're taking a chance on this one.

Das K&F Concept magnetische Handykamera Objektivset bietet eine großartige Möglichkeit, Videos und Fotos mit dem Handy auf ein neues Level zu bringen. Besonders der ND2-32 Filter hat mich beeindruckt, da er die Qualität meiner Videos deutlich verbessert hat. Einzig der Clip hat sich als etwas unpraktisch erwiesen, da er einige Funktionen in der ProCamera App verdeckt.

Meine Erfahrung:
Die magnetische Befestigung des ND-Filters ist sehr einfach und komfortabel. Der Filter lässt sich schnell und sicher am Handy-Clip anbringen und wieder entfernen. Besonders bei Videoaufnahmen sorgt der ND2-32 Filter dafür, dass das Licht besser kontrolliert wird, was zu gleichmäßigeren und professionelleren Videos führt. Die gewohnte K&F Concept-Verarbeitungsqualität zeigt sich auch bei diesem Produkt: Das Glas ist hochwertig und die Farbwiedergabe und Sättigung sind beeindruckend.

Vorteile:
Einfaches Handling: Die magnetische Befestigung des Filters funktioniert tadellos und spart Zeit, besonders bei schnellen Wechseln zwischen verschiedenen Aufnahmesituationen.
Qualitätsfilter: Der ND2-32 Filter aus optischem Glas reduziert Lichtreflexionen und verbessert die Klarheit der Aufnahmen deutlich. Besonders in hellen Umgebungen sorgt er für eine hervorragende Farbsättigung und weniger Blendungen.
Universal Clip: Der Clip passt auf die meisten Smartphones und sorgt dafür, dass der Filter sicher auf der Linse sitzt. Dies macht das Set besonders flexibel, egal ob man ein iPhone oder ein anderes Smartphone verwendet.
Kompakte Ausstattung: Mit der mitgelieferten Aufbewahrungstasche und dem Reinigungstuch ist das Set praktisch für unterwegs und gut geschützt.
Nachteile:
Unpraktischer Clip bei ProCamera App: Der Clip deckt bei der Nutzung der ProCamera App leider einige Funktionen auf dem Bildschirm ab, was die Bedienung etwas einschränken kann. Bei anderen Kamera-Apps könnte dies jedoch weniger problematisch sein.
Clip könnte stabiler sein: Während der Clip gut funktioniert, könnte er für noch mehr Stabilität ein etwas robusteres Design vertragen, um in wirklich hektischen Situationen sicher zu halten.
Fazit:
Das K&F Concept magnetische Handykamera Objektivset ist eine tolle Ergänzung für jeden, der mehr aus seiner Handykamera herausholen möchte. Der ND2-32 Filter sorgt für deutliche Verbesserungen bei Videoaufnahmen, und die magnetische Befestigung macht die Handhabung super einfach. Einzig der Clip könnte etwas praktischer gestaltet sein, um bei bestimmten Apps nicht im Weg zu sein. Alles in allem verdient das Set 5 von 5 Sternen, vor allem wegen der hohen Verarbeitungsqualität und der tollen Filterleistung.

Buy the clip indicated above and a kit of two filters always K&F CPL and Black Mist 1/4 for cinema/private production shooting, 67mm to be able to use them also on my Full Frame.
I find a strong and interesting use with DSLR lenses, I can't find a real function on the phone unless I change acquisition software and use third-party/official apps but specific to use the phone in completely manual mode.

Worked great and came with a nice case and cleaning kit. The microfiber cleaning cloth this came with was awesome. Probably the best one I’ve ever used. Great value for the money.

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.

The K&F Concept 67mm CPL Filter and phone clip arrived packed in a high quality printed cardboard box bearing the K&F branding.

In the box you get a 67mm CPL filter, a clip for phone mounting, a cleaning cloth and a nice hardshell carrying case.

The clip is listed for being for an iPhone but will fit most modern phones up to 13mm thick where the camera is located in a corner.

Clip is nice and snug on my Samsung Galaxy S23 and there are no problems with alignment of the filter or any apparent vignetting.

The filter rotates smoothly in the holder without being too loose and is a boon for any images where there are a lot of reflective surfaces that need to be controlled.

Good value for a handy kit.

The K&F Concept CPL filter for cell phone cameras has convinced me overall.

The filter offers solid workmanship and ensures significantly better photos, especially in difficult lighting conditions and reflections.

The clamp mount is easy to use and holds securely on the phone. I find the magnetic mount of the lens particularly practical, which makes attaching and removing it very convenient.

A small disadvantage is that the filter is sometimes a little difficult to align, and with thicker cell phone cases the clamp mount can be a little wobbly.

Despite this, I am very satisfied with the image quality and handling. A good product that I can recommend to all smartphone photographers!