1Hd Light Transmission: HD optical glass lenses with blue film provide chrominance correction and high permeability for a clear and striking view 2Excellent Optical Glass: The eyepiece is made of fully coated optical glass with excellent image contrast and transmission, providing high brightness and excellent texture. 3Viewing 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. 4Versatile: Ideal for observing nebulae and other astronomical wonders, suitable for all 1.25 inch aperture types telescope, including reflectors, refractors, and cat eye telescopes. 5Best Gift: Telescope eyepieces make gorgeous Halloween, birthday and Christmas gifts to family and friends to increase their interest in the field of astronomy.