Specification Brand : Tomantery BulletPoint : Type: Monocular. BulletPoint1 : PREMIUM MATERIALS: The barrels are made of lightweight plastic, while the interior is matte finished to minimize reflections and provide clearer viewing. BulletPoint2 : DESIGN: Equipped with a dust proof cap to better protect it from scratches and damage, the Barlow lenses is also equipped with a screw, which can securely fix the eyepiece. BulletPoint3 : MAGNIFICATION: Not only does it have a 3x magnification, but it also allows for clearer images, up to 3x the sharpness of the image. This allows the user to have a clearer and more accurate observing experience. BulletPoint4 : INTERFACE DESIGN: The front interface of the lens has an outer diameter of 1.25 inches with internal threads for connecting astronomical telescope filters. The rear interface ID is also 1.25 inches, can be connected to the telescope eyepiece. BulletPoint5 : MULTI LAYER COATING: Barlow lenses feature multi layer broadband coating (green film), which eliminates chromatic aberration to a greater extent, resulting in clearer and brighter images, while improving color reproduction. Color : One Color ItemName : Barlow Lens, Cap 3X Barlow Lens 1.25 Inch Plastic Optical Glass Lightweight for Astronomical Observation ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 9 centimeters ItemPackageDimensions_Width : 5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : barlow-lenses Manufacturer : Tomantery ModelName : Tomantery1g6kavsx09 ModelNumber : Tomantery1g6kavsx09 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : Tomantery1g6kavsx09 ProductDescription : 1. MAGNIFICATION: Not only does it have a 3x magnification, but it also allows for clearer images, up to 3x the sharpness of the image. This allows the user to have a clearer and more accurate observing experience. 2. MULTI LAYER COATING: Barlow lenses feature multi layer broadband coating (green film), which eliminates chromatic aberration to a greater extent, resulting in clearer and brighter images, while improving color reproduction. 3. DESIGN: Equipped with a dust proof cap to better protect it from scratches and damage, the Barlow lenses is also equipped with a screw, which can securely fix the eyepiece. 4. INTERFACE DESIGN: The front interface of the lens has an outer diameter of 1.25 inches with internal threads for connecting astronomical telescope filters. The rear interface ID is also 1.25 inches, can be connected to the telescope eyepiece. 5. PREMIUM MATERIALS: The barrels are made of lightweight plastic, while the interior is matte finished to minimize reflections and provide clearer viewing.