I’ve used a number of filters like this one and I’m happy with this one. It reduces light intensity on photos taken with my iPhone camera app, but it’s very subtle compared to some of the others I have used. Rather than increasing the contrast, it tends to crudely, darken the images. This can be really useful when it is very bright outside, but if you take a photo indoors, the result is usually that the brighter colors are just simply dulled. I actually kind of like this effect as it can make images to seem muted. I was expecting it to reduce glare and reflection, but I didn’t really see that in any real situation’s. It’s basically like putting sunglasses over your phones camera.The lens is rather lightweight . The lens plus the case only weighs 114 g while the lens itself with the clip only weighs 61 g. The lens and adapter are small and light enough that I wouldn’t have any problem taking it out for a family excursion. The resulting images I think are worth the minimal added weight.The set also comes with a lens cleaning cloth in a wrist lanyard. Both of which are welcome additions, but I don’t think I will be using the lanyard much if I’m carrying the case with me.The adapter allows you to screw on other 67 mm filters, but I have not tried that because I mainly use 58 mm. However, it is fairly easy to screw on and off the filter, and once screwed on it feels very secure. The clip that secures the adapter to your phone is very nice. I’ve had others like this that press hard metal onto the phone screen. This adapter has a rubberized component that touches the phone screen, ensuring that you won’t damage your screen while clipping on the adapter.I think the filter is a quality accessory for any phone photography enthusiast. I think the asking price at time of purchase is on the higher end, but I do think after using it for a time it’s worth the price. Five out of five stars.

Needed to use an app (used Halide) to manually control iPhone camera settings. The default camera app kept trying to correct the ND filter changes. Other than that, it's great!

Overall this is an excellent higher-end accessory to improve photo and video. It does exactly what a polarizer needs to do.
Fits well on both an iPhone 12 Pro and an iPhone 15 Pro. It's rather heavy so feels less balanced on the smaller phone.
Nice carrying case - it isn't something you'd leave on the phone all the time. Because it's a 67mm size, it doesn't create vignetting when using the ultra wide lens.
It's a bit stiff on rotation, but may smooth out over time. Overall glad to have it for upgraded personal and professional (I handle a lot of content creation in my job) use.

This K&F Concept Clip-On 67mm CPL Magnetic Phone Lens Filter Kit is very easy to use and fits over my iPhone camera perfectly. However, it may not work for other phones with different camera configurations. The filter does help significantly reduce harsh reflections, but I’m not very impressed with its ability to deepen and enrich blue skies. It comes in a nice protective case with a microfiber lens wipe as well. Unfortunately, this is not a rotating circular polarizer like the ones they make for DSLR cameras. On the plus side, it does have a magnetic mount, so it’s easy to adjust and swap out with other filters as needed.

I’ve been using this K&F Concept press-on ND2–32 filter with my iPhone 17 Pro Max and my Samsung Fold 7, and it has been a lot of fun to shoot with. Photography has been a lifelong hobby for me, and I’ve even won an amateur photography award, so I tend to be pretty picky about gear. While no smartphone camera, with or without a filter, is ever going to replace a DSLR, the reality is that no one carries a DSLR around 24/7 the way they do their phone.This filter really adds a new dimension to mobile photography. Being able to control exposure and motion gives photos and video a more intentional, cinematic look, especially in bright conditions. The variable ND range is useful, the glass quality looks clean, and I haven’t noticed any weird color shifting. The design works well and stays put, and it’s easy to move between devices. It’s easyFor anyone who enjoys photography and wants more creative control from a phone camera, this filter is a great way to push mobile shots further. It’s not a replacement for pro gear, but it absolutely elevates what a smartphone camera can do.

Before I get into the actual review a quick heads up. I ordered the 67mm model for my iPhone 17 Pro Max and that turned out to be a mistake because the larger diameter partially covers the phone’s LiDAR sensor. I’ve attached photos to give visual reference. If you have a 17 Pro or Pro Max I’d order the 58mm version.Now to the review. While this is set is sold as a “kit,” in reality, you are buying a filter and getting a free clip for it. I ordered the ND version. With my “real” cameras I only buy the best ND and CPL filters available – the only kinds of filters anyone needs BTW unless you are shooting in a hurricane, mud pit or desert. For my phone I’m more economical. So, I was surprised this quite affordable filter was built so solidly and had nice performance. To me that makes this “kit” a winner.The filter and clip come in a nice zippered hard storage case, which was unexpected and appreciated. The only problem is the interior of the case is lined with a micro shedding polyester material that collects on the filter. The filter should have its own case or pouch. Ultimately, the hard case is nice, but less useful because of this. You’ll want to by a separate filter case if you don’t already own one or you’ll be dusting off the filter every time you go to use it.The filter’s is aluminum construction and feels solid in-hand. The ND dial turns smoothly for good adjustment ability and properly indicates each gradation. Performance is acceptable with some vignetting especially at ND32. I assumed this would be true when I ordered it because it’s true of every inexpensive ND filter, I’ve every tried. But this one is perfectly usable and the photos and video with it on still better than no filter at all. Color accuracy is good except at the corners when vignetting takes over.The clip is all plastic with a bit of a toy-like feel. Still, it’s practical and does its job. It fit’s on my iPhone 17 Pro Max, even with a case on, fine, though just barely. Because of the phone’s wide “plateau” that extends for nearly the width of the phone I have to angle it a bit so that the phone’s camera lenses are ensconced behind the filter with no light able to peer in. If I clip it on the phone perfectly vertical the filter is cockeyed.Bottomline, this is a nice value for the money as long as you understand the limitations. It provides a good bump up in image quality compared to not using a filter, but also comes with the usual baggage of cheap filters. You’ll likely need to do some editing to lessen or crop out vignetting unless that doesn’t bother you.

The K&F Concept Magnetic Variable ND2-32 Filter Set has become an essential tool in my photography kit, especially for capturing dynamic scenes with my iPhone. The magnetic filter adapter ensures quick and secure attachment to my phone’s camera lens, allowing me to adjust from ND2 to ND32 (1-5 stops) effortlessly. This flexibility in light reduction is perfect for achieving creative effects like motion blur in bright conditions or shooting video with a cinematic look. The filter’s high-quality glass maintains sharpness and clarity in my photos and videos. It’s a versatile and well-crafted accessory that enhances my mobile photography experience significantly

PROS+Fits my iPhone 17 Pro Max well+Good Quality Build+Very Easy to Use+At the twist of a dial, you can control how much light transmission is being filtered+Enhances pics and videos in bright light while maintaining excellent color accuracy+This system works well+Includes a lanyard, cleaning cloth and carrying case for everythingSUMMARYIf you have been looking to take your photos further with a ND2 filter, this kit is a great value and recommended!

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.

I am thrilled! I ordered this polarizing filter as a supplement to a similar ND filter, and it is really great!
The clamp for attaching it has a recess for the cell phone so that no light penetrates from behind. This is super smart and works really well with my iPhone 14 Pro Max, even with a thick cell phone case!

The polarizing filter also works well, the magnetic system is practical, but it makes rotating the filter a bit difficult.
The result is impressive (see video). It doesn't work equally well with all reflections, though. It worked great with this glass front, so I used it as an example for the video.