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 catadioptric telescopes. 5. Gift Idea: Telescope eyepieces make great Halloween, birthday, and Christmas gifts for family and friends to spark their interest in the field of astronomy.