This is a good starter filter kit for your DJI OP3 kit. It includes 3 fixed ND filters (16. 64, 256) and a CPL filter. They fit the OP3 perfectly and you can close the gimbal head with the filter on. K&F is a go-to for filters for all photo/video needs and this set is up to par with their quality standard. Ideally, a lower ND filter might have been a better option for this kit as I think an 8 might see more use than the 256. The only other filter you might want to consider is a black mist filter to soften the sharpness that the OP3 provides. Overall it is a good value and another great kit from K&F.

I tried using the variable ND filters on the DJI Osmo Pocket 3, but found them too fidly. Instead I went for this 4 filter kit which works great. AND BONUS: You can stack these filters on top of each other! You can even stack the polarizer on top of the ND filters. PLUS the other thing I like about the K&F concept filters is, they have little indents on the side that you can get your fingernails into to place the filters on the lens and it also makes it easier to remove the filters as well. I tried the other brands, which are good, but they don't have these little finger nail indents. PLUS the camera can rotate the lens to the closed position with the filter on (However, it will not close with stacked filters on—>just one filter on)

This one is better on cloudy days.
I have several polarizing filters from K & F. I think they have made me a better photographer.
It's been snowing lately. I wanted to take photos of the untouched snow. The sun came out and the shine was reflected in the snow. This filter toned down the glare and gave much better shots.
Now, without this filter and my black K&F filter, I never head out to the day.

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.

ND filters cause the image to "darken" in order to be able to film at medium exposure rates or larger apertures.
The Osmo Action is of course not a film camera, so I wouldn't say here that NDs are a must - but if you want to film primarily in the SLOG profiles, want to experiment with long exposure (even in the light), try time-lapse recordings or in the snow sun is on the way, he should think about it.

You definitely can't go wrong with the K&F Concept Set. The filters are of incredibly high quality and come in a custom-made case. The case can be closed securely and is flat enough to be stowed in a backpack.
The filters can be changed quickly, which is important because of course you need a different one in the twilight than in the midday sun.

Incidentally, a highlight is the anti-reflective filter, which filters out reflections in the snow or on the water surface, for example. You really get a new perspective with him, which is fun.

Great filter that is missing in the DJI Basic Pack... often you need an ND filter in the middle of the day!
This is essential for Air 2S drones whose aperture is not adjustable. The quality is there.
Recommended product

The K&F Concept ND filter set is compatible with the DJI Mavic 3 Classic. The set of 4 includes four ND filters (8, 16, 32 and 64). The workmanship is of high quality and the attachment is very quick. With the filter set you are actually equipped for almost all eventualities (regarding the influence of light and weather conditions). You can shoot great videos or take pictures that are much better in terms of quality, color and light play than without a filter.

Good area to film outside in the bright (keyword: 180° rule), even in snow or in midsummer (here ND1-8 would be clearly too little)
Hardly any vignetting on the edge
Fixed stop at 8 and 128, in between points for better/more repeatable adjustment
So far, the filter makes a scratch-resistant impression
Easy screwing and unscrewing
Good case to store the filter quickly and safely
Fits well with the Sigma 24-70 2.8 (protective cap can be placed on filter)