1. First Impression / Build Quality / Fit: The filters are cleanly manufactured, fit the DJI Osmo Action 6 perfectly, and can be easily mounted without having to remove protective cases or other accessories. The optical glass appears high-quality, the mounts are lightweight yet sturdy, and do not affect the camera's balance or handling. The included storage box and cleaning cloth further emphasize the well-thought-out overall impression. 2. Practical Test / Image Effect & Control: In use, the filters clearly demonstrate their strengths. The ND filters, with ND8, ND16, and ND32, cover practical light reduction levels and allow for precise control of exposure and shutter speed, especially in sunny conditions or with fast movements. Motion blur appears more natural, and the overall image is smoother and more cinematic. The CPL filter reliably reduces reflections on water, glass, or wet surfaces, resulting in visibly richer colors and improved contrast. The effect is clearly noticeable, especially in outdoor sports, landscape, or winter scenes, without appearing unnatural. The 28-layer nano-coating proves to be very robust in everyday use: Drops bead up, dust hardly adheres, and even frequent cleaning leaves no trace. 3. Personal Conclusion The K&F CONCEPT filter set is a very worthwhile addition for anyone who wants to get more out of their DJI Osmo Action 6. It combines high optical quality with reliable mechanics and a practical selection of filter strengths. A particularly positive aspect is that the filters remain lightweight and do not negatively affect camera stabilization.