ProMaster 77mm Protection Filter - Pure LightProMaster 77mm Protection Filter Pure Light ProMaster SKU: 69341 Helix SKU: PR693411 OVERVIEW The ProMaster 77mm Pure Light filter protects your valuable lens against the elements such as sand, dirt, oil, water, and even fingerprints without sacrificing clarity or interfering with the natural light transmitted to your camera. Thanks to a special combination of hydrophobic coatings and finely polished SchottTM B270 optical glass, Pure Light Protection