This K&F CONCEPT set of four neutral density filters is for the DJI OSMO Action 6 action camera and provides densities of 3, 4, 5 and 6 stops.The filters are all coated so as to minimise internal reflections and as far as size is concerned, they are near enough the same size as the original lens protector that comes with the camera.One artefact that I noticed in using the filters was that the densest - the 6 stop filter which takes out 98.4 per cent of incoming light - produces noticeable vignetting. This is caused by the fact that the lens is quite wide angled so whilst light that travels straight through the middle of the filter, light that travels at a shallower angle has more filter to travel through and thus the light at shallower angles is attenuated more.These filters allow you to operate the camera in brighter light levels and even though the camera can change the aperture to compensate for changing light levels, this has only a range of two stops so choosing one of these lets you get the exposure back to where you need it to be in order to get the best out of the sensor.The filters themselves are made to a high standard and the anti-reflection coatings cut down on reflections, bearing in mind that the original protective glass does not appear to be coated at all.

I wasn’t expecting a filter kit to go this high but K&F is a pro brand in the camera space and these filters don’t disappoint. They are screw on filters so you will need to remove the OEM Osmo action 6 lens guard and screwing these on. The good thing about this is that your camera’s weight and profile won’t change when screwing these on as opposed to the slip over Nd’s. What’s also nice is you only have to worry about smudges on the one lens that’s attached to the Osmo Pocket 6.This kit is relatively easy to use with the original cap being very tight but will screw off with a little bit of elbow grease. The lenses are durable and can handle mud, rain, snow. They have great motion blur and the 256 on a sunny day still manages the colors very well. These Function like many ND filter that I have used.

This is an excellent filter set. The filters fit perfectly and are easy to install. Colors look good through the filters and the circular polarized functions well allowing you to rotate the filter to cut back on unwanted reflections. Filters seem like they should be very durable as well. These filters are full screw in filters, so the OEM lens cover is unscrewed and these are screwed in its place, this allows the filters to be used in a waterproof case as they do not change the dimensions of the front lens.

I recently grabbed these and it’s a great addition to my DJI action 6 collectionThe quality of the lens are fantastic, made from high definition glass and feature a 28 layer casingThe build feels robust and premium, especially compared to others I have used in the pastOffering a range from ND16 - ND64 gives control over exposure in bright conditions and helps reduce glare and reflectionsExcellent value for money considering the quality and range of filters included, the filters fit perfectly and are easy to screw onFunctionality wise they offer great photos and videos, it gives it a real nice finishing touch for excellent photography, thoroughly impressed.

This K&F Concept CPL and ND filter kit feels like a well-thought-out addition for anyone using the DJI Osmo Action 6 and looking for more control in different lighting conditions. Everything arrived neatly packaged, and the filters themselves feel solid and carefully made.The screw-on design fits the camera securely and threads on smoothly without feeling tight or awkward. Once attached, the filters stay in place and don’t interfere with normal camera operation. Switching between filters is quick, which is helpful when lighting conditions change while filming outdoors.The range of ND filters is very practical. In bright daylight, they help manage exposure and reduce over-bright footage, making motion look more natural and balanced. The CPL filter is especially useful around reflective surfaces, such as water or glass, where glare can be distracting. It also helps bring out more natural contrast and color without making the image look overly processed.Image clarity remains sharp, and I haven’t noticed unwanted color shifts, which is something I always watch for when using filters. The multi-coated optical glass seems to do a good job of maintaining image quality while still providing the intended effect.From a usability standpoint, this kit is easy to work with and doesn’t add unnecessary bulk to the camera setup. Having multiple filter strengths in one set makes it easier to adapt to different environments without guessing.Overall, this filter kit feels thoughtfully made and practical for action camera use. It offers flexibility, solid build quality, and consistent performance, making it a useful option for those who want more control over their footage in a variety of lighting conditions.

High-quality filter kit that makes a noticeable difference in both video and photo quality. ND and polarizer combinations are effective at reducing glare and controlling exposure, even in bright sunlight. Glass feels solid and scratch-resistant, and screw-on design is simple and secure. Colours remain natural and sharp, with no unwanted distortion or reflections.

I've been using this filter set with my DJI Osmo Action 6 for a few weeks now and I'm thrilled. The filters fit the camera perfectly – no wobbling, no readjusting required

This filter kit is a must have for anyone using an Osmo Action. The image quality improvement is immediately noticeable, cutting glare without any unwanted color cast. The functionality is great, with filters that are easy to swap out in the field. I was happy with the fit, as they snap on securely and stay put. The build quality of the glass and frame is excellent. For the variety of filters you get, it is excellent value for money.

These filters have been great with my DJI Osmo Action 6. They snap on and off quickly, so switching between CPL and the different ND options is fast and painless. They also wipe clean easily after a day outside. What I like most is that they do double duty: they improve the footage in bright conditions, and they also act as a protective layer for the lens. Simple, practical set that feels well made and does exactly what it should.

Since I like to use ND filters for a more natural look when filming, I was eager to try the K&F filters, as the brand is known for its quality, and I wasn't disappointed. The filters come in a very well-padded case with a microfiber cloth and, unlike other screw-in filters, are screw-in. This does have the slight disadvantage that, as the name suggests, you have to screw them on after removing the original lens, but it also means they fit 100% securely, which I particularly appreciate when motorcycling or skiing. Furthermore, there isn't an additional filter element in front of the actual lens, which is generally beneficial for image quality. They are also the same size as the original lens, so a previously purchased lens cap fits perfectly. Overall, I am absolutely satisfied and give them a full 5 stars. Top quality at a good price.