have probably 20 reviews on different filters from this company. I don't think I've ever had a reason to write a bad review either. I don't have any calls here either. These clearly use the same high quality optical material. It's just a different form factor, this case for a GoPro. The filters are of the excellent quality I have come to expect from K&F Concept, so they didn't make the materials cheap just because the filters were a different shape and smaller. I bought one of those kids that give you about 100 things for your action camera and it comes with some filters. You can just hold them up to a light and see the difference in quality between these and the ones that came with this kit. They're so much better. I find that for an action camera you need a neutral density filter even more when shooting video in very bright leaf-lit areas. It lets you open your aperture if you want a shower in depth of field, and lower the frame rate if you need that. These are different than a polarizing filter if you're just worried about glare, though. If your problem isn't glare, but simply too much light all around, then opt for a neutral density filter. Luckily, this kit includes three stops of neutral density apertures starting at 1/8 and also gives you a circular polarizing filter to eliminate that glare. The filters fit the GoPro perfectly so I don't have to worry about losing one and great optical quality. I would say such a kit is absolutely essential if you own an action camera. I'm not sure if the value for money for this set can be beat anywhere else.

Bought the polarizer for my DJI action camera, filter was within expectation.No risk of loosing it when camera in use.

perfect, easy to install, good quality

The filter fits the action camera perfectly, and the optical quality is excellent too! CPL filters are a must have for filming. I highly recommend this kit.

The filter works excellently, as I know it from my SLR camera. Since I don't have a GoPro camera, I had to make an adapter ring to attach the filter to my action camera.

The DJI Action 3 camera already takes really good pictures by default, but using ND filters makes the pictures even more intense. The set was delivered in a practical box, ideal for storage on the go.

A CPL filter is used when pictures are to be taken despite strong sunlight and reflections from water or windows. This prevents details from being lost due to overexposure. A polarizing filter (or polarizing filter for short) is a polarizer for light. Polarizing filters are known to be a "must have" for every photographer.

The filters CPL + ND) are only screwed, like the original, so a quick change is possible. The CPL filter is my favorite for photos and videos, whether with my drones, my DJI Pocket2 and now also with the Action 3. Because it gives the colors more contrast and minimizes reflections considerably. The ND8 and ND16 are often used for the ND filters. The ND32 when it's extremely bright, in winter when it's snowing, on days with clear skies and clear sunshine. The ND 64 softens the fast movements in waterfalls and clouds, which comes across really well. Because everything else is razor sharp. Try it yourself and compare the results.

The quality of the materials is impeccable and the processing of the filters is perfect. The attachment is easy, they hold reliably, fit exactly like the original. The filters are also tight underwater, which I tested yesterday in a body of water with a stick extension.

Explanation of the ND filter: I use them for long-term exposure and depending on the sunlight. This allows you to take softer shots. For example, gently blurring waterfalls and clouds.

What is a neutral density filter/ND filter? A neutral density filter is a filter where the glass is completely darkened so that less light can enter the lens.
So it is possible to choose longer shutter speeds and to achieve the corresponding effects, such as foggy water or soft, long-drawn-out clouds. This would not be possible without a filter, as the image would be extremely overexposed or even completely white.

I am very satisfied with this filter set and can recommend it unreservedly.

Thank you for taking the time to read my review. I hope that I could be of some help.

As with other cameras, you should use filters with the Osmo Action 3 in order to achieve the best possible image quality.

To change, the original lens cover is removed and the desired filter is screwed on. The edge of the filter is ribbed and therefore handy.
Each filter is identified by its designation in white letters on the edge.

Conclusion: very stable and high-quality filters

This is my first action camera and I’m not disappointed.