While Sigma is better known for their lenses, today the company is announcing a brand new filter that offers protection for many of said lenses. This new filter is a Water Repellant ceramic filter made with a special heat treatment that evenly precipitates microcrystalline spinel throughout the materials. To that end, Sigma is claiming that the Clear Glass Ceramic is 10 times stronger than a conventional protective filter and three times the strength of a chemically strengthened filters. The lens protector also contains a WR coating which they state repels water, dust and oil, and allows fingerprints to be easily removed.
Again, this doesn’t give you perfect and 100% weather protection, but it’s a start.
More details are after the jump.
Key features of the Ceramic Protector include:
- Scratch-resistant – Sigma’s Clear Glass Ceramic offers a Vickers hardness number of 700HV. The strength of the Clear Glass Ceramic is much stronger than chemically strengthen glass and is; 10 times stronger than conventional filters
- Thinner and lighter – This new protector is up to 50 percent thinner and is up to 30% lighter than previous Sigma filters
- High transmittance – Sigma’s Clear Glass Ceramic offers very high transmittance, making it ideal for use as optical glass
- Water- and oil-repellent coating – The water repellent coating reflects only 0.24 percent of visible light, thereby minimizing flare and ghosting. Its ability to repel both water and oil is also excellent, with water drops bouncing right off, and fingerprints easily to remove.This 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.