Made with original German SCHOTT B270 optical glass, the same high-end substrate used in night vision and scientific optics. Achieves an average transmittance of 99.8% (up to 99.98% at 670nm), preserving your camera's true color and sharpness without quality compromise. With double-sided multi-coating, the filter achieves an ultra-low average reflectivity of just 0.0479% (tested 430-700nm), effectively eliminating ghosting and flare for pure, crisp images even in backlit conditions. The edge anti-reflective black coating further reduces internal stray light. Crafted from solid brass, the 1.5mm ultra-thin frame (weighing only 4g for 39mm size) prevents vignetting on wide-angle lenses. Its lower thermal expansion coefficient reduces jamming risk, and the optimized thread depth ensures compatibility with standard lens caps and stacked filters. The Korean DUEN vacuum-deposited coating repels water, oil, and fingerprints. Stains and smudges can be easily wiped off, while the anti-static properties prevent dust buildup, keeping your filter clean and clear. CNC-machined from solid brass, the frame is built for long-lasting use. The thread design ensures smooth installation and removal, while the ultra-slim profile avoids interfering with your lens's original optical design.