HD GLASS Ultra Clear High Transparency Optical Glass Chemically Enhanced Optical Glass is 4x Stronger HD COATING 16-layer (both sides) Anti-Reflective Multi-Coating Water & Oil Repellent, Scratch & Stain Resistant HD FRAME Wide-Angle Lens Compatible Ultra Thin Frame Glass Mounted with High Pressure Press Technology PROTECT YOUR VALUED LENSES This is the ultimate in clear filters. It will not affect the color balance or performance of your lenses in the slightest. However, constant use will protect your valued lenses from expensive front element damage which could be caused by dirt, knocks or scratches.