SIGMA offers the world's first protective lens filters, Clear Glass Ceramics. Give your precious lenses the care they deserve with genuine protection. Interchangeable lenses are the most important element of photographic expression and represent a valuable personal asset for photographers.

SIGMA has developed original lens filters that meet the company's high standards of excellence. In developing the new protective lens filter, SIGMA utilized an unprecedented collaborative relationship with a glass manufacturer, resulting in a completely new type of glass called Clear Glass Ceramics.

The SIGMA WR CERAMIC PROTECTOR is an extremely reliable filter with exceptional protective capability. The glass-ceramics are a highly durable type of crystallized glass that serves as the base for the Clear Glass Ceramics.

While it has the high permeability required for optical devices, this advanced new material combines greater hardness than chemically strengthened glass and greater flexibility than sapphire crystal glass. These properties make Clear Glass Ceramics the ideal material for lens protective filters.