Specification Brand : Kenko BulletPoint1 : Compatible with Sigma SA-300 camera BulletPoint2 : Helps vision-impaired photographer BulletPoint3 : Made in Japan BulletPoint4 : Knurled for easy finger placement and easy operation when putting on and taking off BulletPoint5 : Filter Diameter: 3.2 inches (82 mm) BulletPoint6 : Country of Manufacture: Japan Color : Black CompatibleMountings : Sigma SA ExternallyAssignedProductIdentifier : 4961607235546 ExternallyAssignedProductIdentifier1 : 0059497102827 ExternallyAssignedProductIdentifier2 : 059497102827 ItemName : KENKO 55MM MOOSE'S Warm POLARISER Filter (235545) ItemPackageDimensions_Height : 6 centimeters ItemPackageDimensions_Length : 0.6 centimeters ItemPackageDimensions_Width : 6 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : camera-lens-polarizing-filters Manufacturer : KENKO Material : Optical Glass ModelName : Sigma -3 SA-300 ModelNumber : 235545 NumberOfItems : 1 PartNumber : 235545 PhotoFilterEffectType : Neutral Density PhotoFilterThreadSize : 55 millimeters ProductDescription : Collaboration between respected wildlife photographer and conservationist B. Moose Peterson of Wildlife Research Photography and THK Photo Products, Inc., has created a circular polarizing filter that uses 81A optical glass made by Hoya, the worlds largest optical glass manufacturer, instead of the clear optical glass of a normal circular polarizer. When using a camera with a split beam metering system (a metering system that employs a polarized half mirror) which is most of today’s auto focus camera bodies, traditional linear polarizers will cause exposure errors due to their light absorption properties. Circular polarizers yield the same optical effect while not causing exposure problems with modern metering systems. For many years, polarizers have been used to remove reflections from non-metallic surfaces such as water and glass as well as being used to darken blue skies to increase contrast in scenic photography. A side effect of both linear and circular polarizes is they cool down or make the overall colour balance of a scene slightly bluish. The addition of the 81A glass corrects the colour temperature, bringing the scene back to the original 5500K for daylight film’s colour balance. The 81A glass creates a much more pleasing and warm colour balance to the entire scene while the circular polarizer increases colour contrast and reduces the effect of atmospheric haze. ProductSiteLaunchDate : 2023-04-08T02:28:29.132Z Scent : As show Size : 82mm StreetDate : 2018-04-06T00:00:01Z Style : Single Item SupplierDeclaredDgHzRegulation : not_applicable WaterResistanceLevel : not_water_resistant