This is an excellent quality set of ND filters from K&F Concept designed specifically for the Osmo Nano. The set includes four filters with different levels of darkness, and what I appreciate most is that you can fine tune the density directly on the lens once it is installed. This is a noticeable upgrade from other ND filters I have used that only offer a fixed setting. Having adjustable control gives you a lot more flexibility when you are shooting in bright environments or when you want to achieve smoother motion blur for video.Installation takes a little extra effort. You do have to remove the original lens cover and lift off the protective case before these filters can be screwed in. Because of that, it is not the fastest option if you plan to switch between different lighting scenarios quickly. However, once attached, the filters feel secure and well made, and they deliver a clean and consistent image.In actual use, the filters create a strong anti glare effect and help maintain proper exposure without blowing out highlights. They work especially well for outdoor footage where lighting can shift throughout the day. If you film a lot with the Osmo Nano and want more creative control over your shutter speed and exposure, this set is a great addition to your kit. It offers strong clarity, smooth adjustment, and reliable build quality at a very good value.