1HD Lens: The astronomical telescope eyepiece uses HD optical glass lens with blue film, can provide chrominance correction and high permeability for a clear and striking view. 2Excellent Performance: The lens of the telescope eyepiece is made of fully coated optical glass with excellent image contrast and transmission, providing high brightness and excellent texture. 3Enhanced Viewing Comfort: With a large focal length of 25 mm, it will not cause fatigue to your eyes during a long time of stargazing, providing a 52 degree field of view angle, the image is clear and sharp, and the contrast is extremely high, so that you can stay comfortable. 4Versatile Use: The blue film telescope eyepiece is ideal for observing nebulae and other astronomical wonders, suitable for all 1.25 inch types of telescopes, reflectors, refractors, and cat's eye telescopes. 5Easy to Install and Use: Simply screw the eyepiece into your telescope's focuser, and you're ready to start exploring the universe, convenient and time saving, don't need too much tools or complicated steps.