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Sigma Develops Clear Glass Ceramic Filter Share This on LinkedIn   Share This on Google   Tweet This   Forward This

15 December 2015

Sigma has announced the development of a clear glass ceramic filter with a water repellent coating that reflects only 0.24 percent of visible light. The scratch-resistant coating protects the filter from water, which "bounces right off," and fingerprints, which are "easily removed with a quick wipe."

On a Web page describing the new filter, Sigma claims the new technology offers a Vickers hardness number of 700HV, which has 10 times the strength of a conventional protective filter and three times the strength of a chemically hardened glass filter.

And it's 50 percent thinner, weighing 30 percent less than previous Sigma filters.

The company released a short video highlighting the features of the new protective filter:

The Clear Glass Ceramic is made in Japan using newly-developed crystallized glass from glass manufacturer Ohara Inc., Sigma said.

Filter sizes include 67mm, 72mm, 77mm, 82mm, 86mm, 95mm and 105mm.

Sigma WR Ceramic Protector

The Sigma Corp. is pleased to announce the world's first Clear Glass Ceramic protective lens filter.

Interchangeable lenses are the most important element of photographic expression and to the photographer they are a valuable personal asset. To help photographers continue to use for many years the lens systems in which they have invested their time, knowledge and budgets, Sigma has developed original lens filters that meet the company's high standards of excellence. In developing its new protective lens filter, Sigma has leveraged an unprecedented cooperative relationship with a glass manufacturer, resulting in a completely new type of glass called Clear Glass Ceramic. Featuring this advanced material, the Sigma WR Ceramic Protector is a highly reliable filter with outstanding protective capability.

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.

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