Sigma Intros First Clear Glass Ceramic Protective Lens

Sigma Intros First Clear Glass Ceramic Protective Lens

New scratch- and shock-resistant material provides protection for investment.


Ronkonkoma, NY—Sigma Corporation of America, a leading DSLR lens and camera manufacturer, introduced the Sigma Water Repellent (WR) Ceramic Protector, a lens filter that features new Clear Glass Ceramic material to provide enhanced protective qualities. Pricing and availability were not announced.

The shock- and scratch-resistant Clear Glass Ceramic was developed specifically for Sigma in partnership with a glass manufacturer. Made with a special heat treatment that evenly precipitates microcrystalline spinel throughout the materials, the Clear Glass Ceramic is said to be 10 times stronger than a conventional protective filter and three times the strength of a chemically strengthened filter.

Sigma Water Repellent Ceramic Protector

The lens protector also contains WR coating, which repels water, dust and oil and allows fingerprints to be easily removed. This enhanced protection helps to preserve the lens and ensure long-term image quality.

“The Sigma WR Ceramic Protector is the latest example of Sigma’s dedication to innovative and first-to-market photography equipment,” said Mark Amir-Hamzeh, president of Sigma Corporation of America. “The new Clear Glass Ceramic protector is the first of its kind and the strongest material used in the industry. It will enable photographers to safeguard their lenses, while maintaining the impressive sharpness offered by high-quality glass, like our Global Vision line of lenses.”

Sigma’s Clear Glass Ceramic offers a Vickers hardness number of 700HV for scratch resistance. Its strength is stronger than chemically strengthen glass and was tested to be 10 times stronger than conventional filters. The new protector is also up to 50% thinner and up to 30% lighter than previous Sigma filters.

In addition, Sigma’s Clear Glass Ceramic offers very high transmittance, making it ideal for use as optical glass. And Sigma says its water-repellent coating reflects only 0.24% of visible light, minimizing flare and ghosting.

The new filter is offered in the most popular filter thread sizes and is compatible with all Sigma lenses and other lenses that accept front filter threads that are 67mm–105mm diameters. As with all of Sigma’s lenses, the filter is checked with Sigma’s own Modulation Transfer Function (MTF) measuring system, “A1,” in the company’s factory in Japan.