The SIGMA WR 72mm Ceramic Protector filter is the World's first camera lens filter manufactured from ceramic
Why ceramic? With many applications in aerospace and other industries, glass ceramic is an extremely tough type of crystallized glass that serves as the foundation for Clear Glass Ceramic. While featuring the high transmittance required of optical devices, this advanced new material combines greater hardness than chemically strengthened glass and greater flexibility than sapphire crystal glass. These qualities make Clear Glass Ceramic the ideal material for protective lens filters.
Sigma 72mm Ceramic WR Protector filter, Protective filter case
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