This product was sent to me for review, as part of Amazon Vine. The below is my own real-world experience of using it.

I was drawn to it, because I occasionally like to shoot wildlife videos with my iPhone 15 Pro Max, and thought that the filter would be most helpful during very sunny days.

The kit is comprehensive - you are getting the magnetic filter attachment, the filter, a cleaning cloth and an exceptionally good-quality case to store everything inside. This itself is compact, so would easily fit inside a small bag.

I have mixed feelings about some of the components - the main filter attachment is robust, but doesn't fit well over a case. The one I use is not the thickest, but it was enough to impede the attachment from lining up properly with my phone's lenses. I also don't like the screw clamp - the idea of putting pressure on my phone's screen makes me uncomfortable, especially because you can tighten the screw quite a bit. The magnet works fairly well to hold the filter, though it didn't seem like it had the strongest of holds, so I am unsure for how long the filter could reasonably be held in place, particularly if you are moving around a lot in the field.

Despite the above, the filter itself does make a difference in harsh light, though I would recommend checking some settings first - I didn't realise that my flash was set to 'auto', so it fired underneath the filter, and washed my first attempt at a picture out (the flash is obscured underneath the filter, so the light is bounced back).

Overall, it is a nice kit, but could be improved.

Very well made and fits well on my phone and tablet securely and does the job well
Comes in a nice padded case .

I use my iPhone half for personal use and half for my job. I have to take photos for work every now and then (which has nothing to do with artistic photos) and over time I have acquired a few accessories to make it easier to take usable photos.

This tool is really great, you get numerous additional options by simply "clamping on" the "lens". Especially when the light from natural light is too strong, you can use the filter to effectively reduce it as desired and without having to compromise on the colors.

I also find it incredibly easy to use, you don't have to screw anything onto the phone, just quickly clamp it in place and you're done.

One small disadvantage (at least with the iPhone 15 Pro Max) is that you have to remove the phone case so that the lens fits neatly and doesn't stick out.

But as soon as I use the phone exclusively for photos, I don't mind removing the protective cover.

I think the filter is great with its easy application and excellent functionality and therefore give it a well-deserved 5 stars!

I've started producing more videos and photos using my phone. Personally, I find shooting video more practical with my iPhone 12 than using my Sony camera sometimes.

This adapter really helps me get the right exposure for everything I've been shooting lately. Simply clip on the adapter, rotate the filter left or right, and then start shooting!

The product is simple and easy to set up and I've been able to capture some fantastic content with it so far! It's also made me consider other adapters to see what other types of content I can create!

The filter's workmanship is excellent. Thanks to the clamp, the filter holds firmly to the iPhone camera. Well, theoretically, to any camera on any phone.

The workmanship is good, the settings are easy to make.

It's important that you can adjust the camera manually to achieve an effect.

So far, everything's good

So the thing I like about this most, design wise, is just how easily I can use it, I don’t have to faff about screwing things on, or lining things up, it’s just quick, simple, clip over, and I’m off shooting photos.
I think the difference goes from “there but not obvious”, to, “noticeably there(because I know the filters there)”, and I don’t mean other people would know I’ve used a filter, but they definitely notice the difference in shots.
The quality feels good to me, the “clip” has decent retention, and feels strong enough that it won’t slip or fall off, but also, it feels strong enough that it won’t become looser and looser after “however many” clip on, clip off, cycles, so that’s a good thing.
All in all, I think this is a great way to switch up shots and get that deeper pic, very happy with it.

I got this product as a Vine tester.
Tested: K&F Concept universal cell phone camera lens set, filter for cell phone camera, 52mm variable ND2-ND400, only for iPhone
Price when purchased €23.49 minus 10%

A small box was delivered. It contained a plastic box with the filter already screwed on. A layer of foam holds the filter securely in the box. Outside the box (in the orange bag) is a microfiber cloth.

Positive: The clamp does not touch the filter when removed. However, part of the inside is coated with silicone.
The clamp is strong enough to hold securely on the iPhone (in my test 15 and 13 each Pro max) with a case. Of course, this is not for action photos/films. The clamp would not hold that tightly. Without a case, it grips even better. The silicone layer then lies flat on the display. It is also well planned on the filter side. I use extra protective glass for the cameras. Even they can't get to the filter because of the raised filter.
The included filter can help reduce the amount of light coming through in bright light conditions. The filter can be rotated on its own. I hope that you can see it a little in the video. You can't feel the filter reappearing from the "blue".

I also bought the 52mm polarizing filter from the same brand because I know the effects from my SLR.
The filters should never be screwed onto the clamp too tightly. Otherwise they are difficult to remove.
When rotating the filters, the clamp may be moved in an unfavorable way (if you are using a protective cover). This may cause the filter to fall off or cause a vignette effect.

I can't use my old filters from my SLR here because my lenses were much larger. However, if you have 52mm filters, you can experiment further here.

You can't go wrong with the K&F brand. Anyone who wants nice, clear images when taking photos will be happy with this. I also recommend the polarizing filter (Amazon number B0C2GWS95B). The included filter also reduces reflections.

This ND filter was developed specifically for the iPhone. This should be taken into account, otherwise the verdict will probably not be so favorable. The special thing about it is that this ND filter with its filter ring completely encloses the camera module of the newer iPhones. The actual filter then lies directly on the lenses and sits really well.

Unfortunately, this doesn't work with a cell phone case that has a camera protector. Then the camera module becomes too big and the filter no longer fits over it.

The whole thing is held in place with a fairly tight clamp, which of course then covers part of the display. But in my opinion that's not particularly important.

The filter can be adjusted from filter strength ND2 to ND400 by simply turning it. The whole thing is done with a quarter turn, so all levels are pretty close together, so you should turn slowly. There is a 10-level division on the ring, but it can still be adjusted continuously. The filter does not always have the same effect on all three lenses. With the ultra-wide angle of the iPhone 14pro, for example, you can get the filter ring in the picture with some settings. In some settings you notice a slightly stronger vignetting. You have to try it out a bit, but you can get the hang of it quickly.

Who needs something like that? Certainly no one who doesn't know straight away what an ND filter does. The product is aimed more at photographers who want to get even more out of the iPhone and, especially in bright light, still want to use long shutter speeds. To do this, you would have to delve a little deeper into the subject. There are numerous, very good YouTube videos on the subject...

I think it's really great that the filter holder or clamp with a 52mm thread can also accommodate other filters. A polarizing filter or graduated filter would be exciting here for different effects.

In any case, I am very happy with this ND filter, even if I probably won't use it that often. I tend to take the photos or videos that can be produced with it with a system camera. But if you're travelling light or want to experiment with iPhone photography, this is the right choice. The price is unbeatable for this great quality.

Darkening filter lens with clip to attach it to the iPhone (works on all models).
The lens can be unscrewed, it has a 52mm thread and can also be inserted on some Canons.
Useful in case of direct exposure to the sun, otherwise the iPhone will be able to adjust the brightness independently without any problem. I really like the effect that is created when you overcome the darkness of the lens, creating these blue-purple edges.
If you also own a reflex it becomes a valid purchase also in economic terms.

Here is a neutral density filter that can vary from 2 to 400, which is a very nice range.
It is mounted on a clamp that is the thickness of a smartphone.
It has a diameter of 52 MM, so it is wide enough to cover most lenses, smartphones and not just iPhones.
This filter holder is screwed onto the clamp, which means that it can be perfectly removed and installed on a camera with a 52 mm lens.
As a result, you can also imagine adapting any 52 mm filter. For example, a polarizing filter on this clamp.
Well seen.
A cleaning cloth is also supplied with it, which is always good to have on hand.