The K&F CONCEPT Go Ultra CPL ND filter set came with a plastic case and cleaning cloth. The filters appear to me to be perfectly processed. They are easy to attach to the Go Ultra: Just unscrew the standard attachment from the lens and attach one of the ND filters or the CPL. They fit perfectly, but are significantly larger than the original. So there may be a problem with additional cases or holders for the Go Ultra, as they stick out over the edge. The CPL filter, as I know it from large ones, can be adjusted simply by turning it. The ND filters darken according to the values. This is a useful addition for more demanding video recordings with the small action camera. I'm happy so far.

Fits the camera perfectly, but bigger than the original one

The K&F Concept filter kit for my Insta360 GO Ultra is a success that has left me with my mouth open. I always shot barefoot and the movement came out with a horrible state, that robot effect that kills any video, but these NDs are the solution: if you really want to record, you have to lower the shutter speed for natural motion blur, and without filters in full sun it's an impossible mission. The pack comes with ND8, ND16, ND32 and CPL. You unscrew the original protector, which comes tight as hell but comes out with a rag, you screw in the filter and it grips like a tick. The 31 mm diameter avoids vignetting on that angular beast of the GO Ultra. I have caught rivers that flow like silk, smooth traffic, people on the move without strange jumps, all with shutters at 1/60 or 1/120, without burning lights and with happy stabilization. Neutral colors, intact sharpness, zero rare dominants. Compared to the official Insta360, just as good and half the price. CPL is gold: it removes reflections from water, glass or puddles as if by magic, and saturates skies until they leave them as a postcard. It has a white mark for quick orientation and to see the effect live. Yes, at an extreme angle, a central dark band can appear, typical of circular polarizers, but a cutout or a little rotation can be solved. It works and is pro. Premium quality: aluminum frame, multi-layer glass that repels water, dust and fingerprints. Soft but firm thread, they don't come loose even with wiggling. They come with a cleaning cloth and a hard plastic case that protects against shocks, although it's a little big for the pocket. The filters themselves are larger than the original protector, almost twice as large, and although they don't bother with functionality, they break the discretion of the GO Ultra a bit. If you wear it in black, it shows more. Be careful with the water: they are not for diving, it is better to leave the original protector if you are going to get it wet. And if you're looking for Black Mist-like diffusion, skip those from K&F for now; there are reviews that say you barely notice the effect. But for ND and CPL, this is what you need. As I said, if you're shooting outdoors and you hate staking, these filters are mandatory. They lower the light, give control, and turn your clips into movies effortlessly. 100% recommended if you want pro results without paying twice as much.

Very good little kit, the filters are well finished and fit perfectly on the GO Ultra without play or parasitic reflections, the CPL brings out the colors well and the ND allow you to keep a fluid image even in direct sunlight. The rendering is clean, no color drift and the editing/unmounting is done in two seconds, it really changes the quality of the videos. Frankly, an essential accessory to get the most out of the camera while protecting the main lens

I have been using the K&F CONCEPT Go Ultra CPL ND filter set (pack of 4) for a few weeks now and am very satisfied. Strengths: Very good glass quality: The image quality is clear and rich in contrast, with no visible loss of sharpness or color tint. To be screwed on like a protective filter: Can be screwed onto the front of the lens and virtually replaces the permanent handle for lens protection — great for working quickly. Larger than the original lens: The front dimension is deliberately generously designed, meaning that the effect is uniform without vignetting, even at a wide angle. Sophisticated design: Clean lettering, grippy knurling, runs smoothly — you can tell that thought has been taken here. Metal thread: sturdy, perfect fit and durable; no wobbling, no snagging Good price: Absolutely fair for the quality offered and the scope of delivery. Weakness: Large plastic case: Protects well, but it's a bit bulky for my photo backpack. Practical use: ND filters in particular are indispensable for generating motion blur (flowing water, road traffic, people motion) in bright lighting situations. The CPL works reliably against reflections and ensures rich colors. Conclusion: A highly recommended set with high-quality glass, clever design and robust metal thread. Anyone who works seriously with ND/CPL gets a lot of money for their money — only the case should be more compact.

The kit includes three neutral density filters with 3-step (ND8), 4-step (ND16) and 5-step (ND32) reduction, as well as a circular polarizer. The installation requires first unscrewing the original lens protector, which is fairly tight at the factory. The diameter of these filters is 31 millimeters compared to 23 of the original protector, a difference necessary for the flat surface of the glass to avoid vignetting on the edges. I have tested all three ND filters in bright light conditions (beach and snowy mountains) and they reduce exposure correctly allowing for slower shutter speeds for motion blur effects. The circular polarizer has a white mark on the edge that indicates polarization orientation. I have noticed that due to the very open angle of this camera, a central dark band may appear with lighter sides, a characteristic effect of wide-angle circular polarizers. Using cropping modes minimizes this problem. For outdoor recording with intense lighting, they are a useful tool that improves final image quality.

The K&F CONCEPT Go Ultra CPL ND filter set is a high-quality accessory for anyone who wants to use their Insta360 GO Ultra creatively. The set includes CPL, ND8, ND16 and ND32 filters, each ideal for different lighting conditions. The polarization function reduces annoying reflections, while the ND filters effectively prevent overexposure in bright daylight. The 28-layer multi-layer coating ensures razor-sharp images and minimizes light reflections. The aluminum alloy frame makes the filters robust and durable without making the camera unnecessarily heavy. It's easy to use: apply filters, adjust, and instantly get better control over exposure and color. I am very satisfied with this set: It significantly expands the creative possibilities of the Insta360 GO Ultra and delivers professional results that are clearly visible, especially when shooting videos or outdoor photography. Conclusion: High-quality, robust and functional — a must-have for all Insta360 GO Ultra users who want to optimize their recordings.

Great quality filter set. They come in a nice case which is handy to keep them stored safely in the bag when not in use. Easy to put on and take off while staying securely on the camera. They make shooting in bright conditions easy and produce some great results. I'm still learning when is best to use each filter type, but I've already got some great videos using them. Good value for money.

This four-pack of K&F Concept Go Ultra filters has three neutral density filters and one circular polarising filter. To use them, you need to unscrew the protective glass that is already on the camera which can be on quite tightly, then just screw on the one you want.One thing to note is that the original lens protector has a convex surface and as a result of that, the glass can be a lot smaller. These four filters, however, are made from flat glass and so as not to get vignetting they are a lot larger - 23mm for the curved glass and 31mm for these flat filters.The three neutral density filters are three, four and five stops which should darken down the sort of illumination levels that you will experience in snow or bright sunlight.The polarising filter only has the edge of the rotating portion on the front so you can screw that in in the same way as the other filters. There is a small white mark on the edge that lets you know the orientation of the polarisation so that you can set it up quickly.The polariser in this case is circular polarising as opposed to linear polarising and you can get into trouble with that where you wouldn't with a linear polarising filter - with it being quite a wide angle, with a circular polariser, you can end up with a dark band where a lot of polarised light is absorbed but lighter bands on either side where less is absorbed, making the picture inconsistent. You will find that you get better performance from it if you select cropping modes that use less of the sensor thus eliminating any banding.This is a useful kit to keep with you if you need to reduce the amount of reflected light in your images or if the lighting conditions are too bright for the sensor.

Set of K&F Concept filters designed specifically for the Insta360 GO Ultra, really useful for those who want to make the most of this small action cam, especially when shooting in bright light or want to give a more professional touch to their videos. The kit includes four filters: an ND8, an ND16, an ND32 and a CPL polarizer, practically everything you need to manage the most common situations you may encounter while shooting. The filters have a well-finished metal frame and the lenses seem to be of good workmanship with a multilayer treatment that helps reduce reflections and protects against dust and fingerprints, although obviously you should always handle them with a little attention because the small size makes them delicate. The installation on the GO Ultra is very simple, the filters are screwed directly onto the camera lens safely without wobbling, and this is essential considering that we are talking about an action camera that is often used on the move or attached to moving surfaces, once mounted they do not interfere with the rest of the camera and do not create vignetting in the footage, which frankly worried me a bit given the ultra wide angle nature of this small camera. ND filters are particularly useful when shooting in broad daylight or in very bright environments, they allow you to reduce the amount of light that enters the lens without altering the colors and this gives you the opportunity to use longer exposure times to obtain that natural motion blur that makes videos much more fluid and cinematic. The ND8 is good for slightly cloudy days or for the late afternoon, the ND16 is perfect for full sun while the ND32 I use it mainly when there is really a lot of light such as in the mountains on the snow or at the sea with the reflections of the water. The CPL polarizing filter, on the other hand, is what I use the most when I want to eliminate reflections from surfaces such as glass or water, or to make the sky more saturated and dramatic in outdoor shooting, it works well and by rotating it you can clearly see the effect it has on the scene so it's easy to find the right angle before starting to record. Overall, however, I am really satisfied with this set, the quality-price ratio seems honest to me considering that these are four filters of decent optical quality and that allow you to significantly expand the creative possibilities of the GO Ultra, if you often use this outdoor action camera or want to give a more professional look to your videos, I definitely recommend considering them.