Heliopan 52mm KR1.5 (1A) Skylight Filter (705215) with specialty Schott glass in floating brass ring Heliopan's world-renowned 52mm Skylight Filter reduces reflections and increases overall color accuracy and clarity. The light pink coloration of the lens helps to reduce the bluish cast brought on by daylight and is particularly effective when capturing landscapes and subjects in the shade. The Skylight 1A Filter also functions as a general protective layer for your delicate lens element and aids in reducing dust and moisture. Filter Factor: Approx. 1.1 Constructed from the highest German Schott Optics, which guarantees incredible optical resolution. Our glass is specially ground and polished to minimize internal reflections, while ensuring that the quality of your images are not degraded by using our optics in front of your lens. It is also specially hardened to resist most impacts. Our standard 8-Layer Multi-Coating minimizes reflections and does not interfere with the resolution of your camera optics. Our precision cut brass ring ensures a secure and sturdy fit, are more resistant to side impacts, and less likely to bind or cross-thread after extended use. We do not source any materials outside of Germany in the assembly and construction of our products. All raw materials are prepared and hand-assembled in our factory and do not leave our facility until they are completely inspected by our quality technicians.