Feature: 1. Hd Light Transmission: HD optical glass lenses with blue film provide chrominance correction and high permeability for a clear and striking view 2. Excellent Optical Glass: The eyepiece is made of fully coated optical glass with excellent image contrast and transmission, providing high brightness and excellent texture. 3. Viewing Comfort: With a large focal length of 10 mm, providing a field of view Angle of 52 degrees, sharp clear image, extremely high contrast, and will not cause fatigue to your eyes during long term stargazing. 4. Versatile: Ideal for observing nebulae and other astronomical wonders, suitable for all 1.25 inch aperture types telescope, including reflectors, refractors, and cat eye telescopes. 5. Best Gift: Telescope eyepieces make gorgeous Halloween, birthday and Christmas gifts to family and friends to increase their interest in the field of astronomy. Specification: Item Type: Astronomical Telescope Eyepiece Material: Aluminum Alloy + Optical Glass Focal Length: 10mm Interface Size: 1.25 Inch Thread Size: M28.6X0.6mm Lens Coating: Blue Coating. Package List: 1 x 10mm Eyepiece 1 x Storage Box