Sigma WR Ceramic Protector Filters
Sigma Water Repellent (WR) Ceramic Protector Filters (Available here) feature a new Clear Glass Ceramic shock- and scratch-resistant material with enhanced protective qualities that are 10X stronger and 30% lighter than conventional glass filters These Clear Glass Ceramic filters are made with a special heat treatment that evenly precipitates microcrystalline spinel throughout the materials, the […]
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