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.

As a wedding photographer these small compact bag holds it all from camera flash keys and light accessories I love this bag

have been a fan of K&F Filters and many of their other photography products for some time and have come to appreciate the brand's durability and quality. Most of my lenses live their life with a K&F Concept UV protection filter on the front. I have sufficiently tested the transmittance and sharpness of K&F UV filters in the past, so I now consider them a trusted brand. I am confident in their quality. And that's the point, right? In my opinion, they are a trustworthy seller. I needed a protection filter for a 24mm-70mm zoom lens I recently purchased. The ultra-thin frame of the MCUV filter is what caught my eye and the reason I ordered it. And for that reason, it worked well. When the lens is set to the widest focal length, 24mm, the Ultra Slim Filter does not affect the image area. Therefore, it does not cause vignetting. UV filters are effective when shooting on film, although some emulsions are/have been formulated to be insensitive to UV light. However, they offer little to no additional benefit when capturing with a digital sensor. Modern digital sensors record the entire spectrum of visible light unfiltered, as well as portions of the invisible infrared and ultraviolet light spectra. To record only visible light, so photos look like how we see the world, digital camera manufacturers install what is called an IR-cut hot mirror filter over the digital sensor and Bayer array. Digital cameras sold without this filter are called a "full spectrum camera." If you're not sure if your camera is full spectrum, it isn't. That means you don't need to filter out UV light, the manufacturer has already done that for you. In my digital imaging, I use UV filters to protect the front element of expensive lenses. And in this regard, the K&F Concept MCUV filter offers protection for expensive lenses without affecting camera settings or image quality, thus providing cost-effective insurance. If it happens to offer an additional UV filter, that's a bonus. The physical properties of the filter are, without exaggeration, its almost feather-light weight as well as the faceted chinas around the perimeter that provide a good grip. I use a 67mm — 62mm graduation ring for the filter. The thread on the front of the filter provides sufficient depth for the secure attachment of the ring and thus the associated stacked filter. The K&F front lens cap that comes with the filter is equal in quality to, if not improved upon, the OEM lens cap that came with the lens. The clamp levers are easy to use, firmly spring loaded and ensure a firm hold of the filter or lens. As I mentioned at the beginning, I have come to rely on the quality of K&F filters for the reasons the seller claims, but most importantly for me, the high quality of their multi-coated AGC anti-reflective glass. AGC, a Japanese company, is the largest glass manufacturer in the world. Another reason why I have confidence in K&F filters. The filter comes with a lens cap, a lens cap lanyard, a high-quality microfiber lens cleaning cloth and a plastic storage case. K&F Concept offers good value for money and doesn't cut corners.

Well, the instructions are for a previous model, or firmware perhaps.
Reading those, and then the reviews apparently referring to those instructions, I was skeptical.

So, this all got hooked up on my desk first, not my car. This is a real review.

Things I found:

Instruction sheet (and several reviews) says you can only record two streams is incorrect. When you plug in the back camera, all three streams record, every time. There isn't even a way to turn one off, other than unplugging the external camera.

Video quality: great on the forward camera. Pretty good on the interior camera. Not great on the external rear facing camera.
It's OK for video evidence of that guy hitting your back bumper, while the front cam shows a red light, though.

Options: Motion trigger. This works, for a while, then it doesn't. It records several clips then the option just turns itself off. And the recording stops too. So don't use that. It's a bad idea anyway, at a quiet intersection, nothing moving in front of you, motion detect sees no motion, so no video, and a guy sideswipes you. You'd miss that accident with motion detect because it only watches the front camera.
I tried this with and without the "G-Sensor”, as it appears to be a vibration sensor.

Parking: I kind of made that work, by turning Parking + G-Sensor + motion, and it recorded a locked clip when I tapped it with my hand. I had a couple successful clips.
I didn't pursue this very far, because the instructions say to never leave Parking (or motion!) turned on for driving, you have to set both manually EVERY time you park on two different config screens. I thought this mode would just be automatic when you parked. This doesn't interest me at all. I tried it anyway, and ran into the same problem as before. The Motion detect just goes away after a while, and the recording stops completely.

Phone App: For bandwidth reasons, to watch the video on your phone, this operates on WiFi, not bluetooth. Which means connecting your phone to a local hotspot the camera creates, every time. Then you have no internet, because it's a hotspot without internet, right? It's very annoying. I'd rather just have the files and utilities available on the app, download the videos to play them, and use BLUETOOTH instead. That's not how this works though.
The camera continues working while streaming to your cell phone. But the camera is stuck on the "WIFI" screen, you can't exit or use any functions or buttons while connected to your phone.

The APP Viidure, works OK, and there are a few camera settings in there. Not all, just a few. Plus you can download your video clips into your phone.
(HINT: Its much faster to just put the card in your computer with a card reader)

Through 2 days of testing, I didn't experience any lockups while in WiFi mode, or during testing the camera.

For what you get, it will do the job. You don't need to connect your phone all that often, or use motion, or parking modes. Then you have a 3 camera 1080/720/720 system for $89 at the time of this review. That's OK, there's some value there, especially an uber driver situation when you need a camera on the back seat. I’d like a 3.5 star rating for this one.

It's not hard to notice for $20 to $40 more there are 4k/2.5k systems with much higher res cameras, that may have better functionality. I don’t have one to compare, but just saying it's worth thinking about.

This light was a great addition to my GoPro since they dont have a flash built in or night mode. The light has some really fun settings to add effects to your video and pictures.

I love this camera. It takes way better pictures than my phone, especially at night with the flash or if I need to zoom in. Plus, it’s super easy to transfer the pictures to my phone.

Delivery was the same day, packaging was neat. the small "Gift" the flash attachment just came in handy. To the lens. very light plastic housing, sits very tightly on the camera, has small problems here and there that the contacts are all properly seated. The AF motor is audible but not noticeable from a distance of about 1m. The AF could be a bit faster if you want to capture movement, but for products or portraits where speed is not important, it works well, even in low light. In the studio with lots of light, it is certainly an inexpensive alternative to one of the top dogs, outdoor for the hobby photographer with a small budget an absolute recommendation. For this price, an absolute top lens. My sample image: reduced to 1200*800px Nikon D750 ( ISO320 - f/2.8 - 1/250sec. - Daylight with small flash from the side, base plate and background each a black pane of glass. )

Since my English is better, please excuse not writing in German. Situation: I bought a new 60D body, needed a lens to learn and grow with. This lens was my one and only lens and I have only on board flash light. How I feel: This is the best lens for me even tho I just bought a new 28-135 USM IS from Canon. It is quite, quick and light. It makes really great photo with soft backgrounds. I can point to where I want and take pictures with ease. Why Canon: The winner is Canon, because the price is very good compare to other lens companies. It is light and fast, it is also a very bright and sharp lens. Why 50mm: It is a lot of work to learn how to use the computer and the rest of the setting. Like me who is a beginner with DSLR needed something simple. 50mm is a standard for full frame and with 60D it acts as a 80mm. Which is good for almost everything except indoor close range. It works great with photo merge in photoshop. It works great with point and shoot. Why F/1.4: As mentioned before, I only have on board flash. I am not saying it is bad, because there are so much to learn about how to use a flash. However, I do like my photos better without flash. In which, F/1.4 allows a lots of light in, this means brighter photo with quicker shutter speed or lower ISO. Everything above F2.8 is sharp. I love photos with soft background and this lens is the best :) Why USM: Quick, quite! I don't think I have to say more. Yes it is very tight on small room, but hey, this is what we know before. 80mm is technically 1.6x zoom. However, we can learn to life with it. If you are beginner like me, you will still have a small old camera to get wider angel, if you are a getting comfortable with DSLR, you will have a second set of lens. So I think this is a must to have :)