Sigma 67mm WR Ceramic Protector Filter

67mm Clear Protection Filter
Prevents Damage to Lens
67mm Front Threads
No Effect on Image
1x Filter Factor, +0 Stop
99.76% Transmittance
Clear Glass Ceramic Construction
Scratch- and Shock-Resistant
Water-Repellent Coating
Durable Acrylic Filter Case

Overview

The Sigma 67mm WR Ceramic Protector Filter is a clear filter designed to guard the front of a lens from impacts, and is characterized by its one of a kind durable construction, which protects from scratching, and other elements. Designed with a clear glass ceramic substrate, this filter combines a high 99.76% transmittance value with greater hardness than chemically-strengthened glass, as well as greater flexibility than sapphire crystal glass. The filter's design is scratch and shock-resistant to handle a variety of impacts while shooting. A water-repellent coating is also applied to resist water droplets and fingerprints, as well as static electricity from collecting dust particles. Sigma's 67mm WR Protector Filter's design also helps to maintain the lens' inherent image quality while providing a high degree of protection. Its unique construction has a Vickers hardness number of 700HV, making it both shock and scratch-resistant. This hardness also decreases the likelihood of scratching or chipping that can lead to the filter shattering. Instead of only the surface structure being hardened, the clear glass ceramic involves a heat treatment process which creates microcrystals of a mineral called "spinel" in order to achieve even, consistent strength across the entire filter. This strength also allows the design of the filter to be thin and lightweight. A water-repellent (WR) coating prevents water and oil from adhering to the filter surface, while helping to minimize ghosting and flare. The coating reflects 0.24% of light, giving an overall transmittance value of 99.76%. The acrylic case (included) protects the filter when it is not in use and is designed to prevent accidental, unwanted opening.

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Specifications

Brand
Sigma - Sigma

Detailed Specifications
Front Accessory Thread Size:	67mm
Front Accessory Thread Size: An adapter that allows threaded accessories to filter kits, such as Lee's Foundation Filter kit. View All Attribute Definitions
Filter Type:	Clear
Filter Type: The type of filter for a lens. Filters can be screwed on the front element or dropped in for larger zoom lens. View All Attribute Definitions
Multi-Coated:	Yes
Multi-Coated: A series of optical coatings that are on a lens/filter that help reduce the impact of reflections. The result is a higher transmission percentage of light. All modern lenses are multi-coated. View All Attribute Definitions
Filter Diameter:	67mm
Filter Diameter: Almost every modern lens has a filter ring/thread on it for a UV filter. Filter Diameter refers to the size (diameter) of the front ring. There are several common sizes. View All Attribute Definitions
Material:	Glass
Material: The substance that something is made out of. View All Attribute Definitions
Filter Factor:	1 (+0-Stop)
Filter Factor: When placed in the optical path, many filters block a certain amount of light from reaching the lens. Filter factor relates to how much exposure compensation is required in order to adjust for this. Most cameras have TTL metering and will be able to do this automatically. View All Attribute Definitions

Physical Specifications
Dimensions:	Box Dimensions: 4.9 x 4.1 x 0.8"
Dimensions: The measurements of an object. View All Attribute Definitions
Weight:	Package Weight: 0.25 lb
Weight: The physical weight of the item without packaging. View All Attribute Definitions