Brightin Star 25.5mm UVP UV Protection Lens Filter-Specialized for 28mm F2.8 Leica M-mount Lens 1. Handcrafted black paint, ultra-thin brass UV. The classic design is more compatible with Leica M system cameras. 2. Customized ultra-thin optical glass with ultra-high transmittance and multilayer coating. 3. Double-layered waterproof and oleophobic design. It is a replacement for the lens cap and is more convenient to use. 4.The ultra-thin thickness reaches an amazing 1 mm. 5. Specially designed for the Brightin Star 28mm F2.8 Leica M System Lens