Right out of the box, the K&F Concept wide-angle lens feels premium and well-built. The metal housing has a solid, precise finish, and the optical glass is crystal clear—no signs of distortion or cheap coatings. It screws directly onto the DJI Osmo Action 5 Pro or Action 4 with a snug, secure fit, just like the original lens, so there’s no wobble or alignment issues even during high-motion activities.Once attached, the 185° field of view is immediately noticeable. It dramatically expands the frame, capturing more of the surroundings and giving every shot that immersive, cinematic feel—especially great for biking, surfing, or travel vlogs. The image quality stays sharp edge to edge, with minimal fisheye distortion and excellent color clarity thanks to the 28-layer nano coating. Reflections and glare are impressively controlled, even in bright outdoor light.What really stands out is how easy it is to use—just screw it on and shoot. No adapters, no adjustments, and it doesn’t interfere with ND filters or other accessories. The nano-coated glass also repels water and fingerprints, making it quick to clean after outdoor sessions.The only caveat is that it’s not waterproof, so it’s best avoided for underwater shots or heavy rain.Overall, this lens is a top-tier upgrade for Osmo Action users who want to expand their creative range. It’s ideal for adventurers, vloggers, and content creators who want that extra-wide perspective without sacrificing image quality or ease of use.