Specification Brand : Cardinal Camera BulletPoint1 : Close-up lenses are for quick and easy close-up photography, which is screwed on to the front of a lens like a filter. These lenses have two achromatic elements to correct chromatic aberrations. They do not degrade the high optical performance of lenses BulletPoint2 : Close Up Filter : +10 Diopter Lens - Decreases Minimum Focusing Distance - Anodized Aluminum Filter Ring - Optical Grade Organic Glass - Plastic Storage Case with Cushion Liner BulletPoint3 : Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "Ø" (diameter) symbol. For example: Ø58 = 58mm lens thread size BulletPoint4 : Compatible with Sigma Lens : 10-20mm f/3.5 Aspherical Wide Angle Lens ExternallyAssignedProductIdentifier1 : 0641796578597 ExternallyAssignedProductIdentifier2 : 641796578597 ItemName : 82mm Close-Up Filter (+10 Diopter) for Sigma 10-20mm Wide Angle Lens ItemPackageQuantity : 1 ItemTypeKeyword : camera-lens-diopters Manufacturer : Cardinal Camera Material : Glass Material1 : Plastic Material2 : Glass PartNumber : CC_C82Si1020_040919 PhotoFilterEffectType : Close-Up PhotoFilterThreadSize : 58 millimeters ProductSiteLaunchDate : 2019-04-12T07:00:00.000Z WaterResistanceLevel : not_water_resistant