I bought this for my smartphone. I tested it, but I couldn't really see a clear effect on my smartphone, so I haven't actually used it. 8K compatible 67mm CPL filter, with multi-coating and waterproof/scratch-resistant features. 【NANO-X & High Light Transmission】Adopting nano-coating, it achieves 99.6% high light transmission, maximizing the original descriptive power of the lens. High-quality optical glass significantly reduces lens flare and ghosting, suppresses reflections, and allows you to freely take bright and colorful photos. 【Green Film & Anti-Reflection】The C-PL filter uses green film to cut ultraviolet rays, remove environmental polarization, make the sky bluer, and control the light reflected on the water surface to make the scenery clearer. 【Water-Repellent and Anti-Stain Coating】The filter surface is processed with 28 layers of nano-coating, achieving water and oil repellency, making it difficult for fingerprints to stick and easy to wipe off dirt. You can shoot with confidence even in harsh environments such as rivers, mountains, and deserts. 【Thin Frame & Durable Stability】With a thin frame of only 5.3mm, it prevents vignetting and can be used with wide-angle lenses. The frame is made of metal, providing excellent durability and stability.