Product Description for 90° Diagonal Zenith Mirror with 2" to 1.25" Adapter Enhance your astronomical observations with our 90° Diagonal Zenith Mirror, a versatile and indispensable accessory for any telescope enthusiast. Designed to provide superior optical performance and convenience, this diagonal adapter prism is perfect for both terrestrial landscapes and celestial wonders. Discover the features that make this product an essential tool for stargazing: Main Function: This diagonal zenith mirror is specifically designed for astronomical telescopes with a 2-inch interface. It is ideal for viewing a wide range of celestial and terrestrial targets, including the Moon, planets, nebulae, star clusters, and diffuse nebulae. Its versatile application makes it a valuable addition to your telescope setup. Clear Imaging: Featuring a 99% high reflective dielectric film, the diagonal adapter prism delivers exceptional optical performance. With high reflectivity and transmittance, it ensures bright, clear, and crisp imaging. Experience the night sky with enhanced clarity and detail, making your observations more enjoyable and informative. Internal Thread: The diagonal adapter prism is equipped with an internal thread, allowing you to mount various filters and telescope accessories easily. This practical feature enhances the functionality of your telescope, providing flexibility to tailor your viewing experience according to different observational needs. 2 Inch to 1.25 Inch Adapter: The included adapter allows seamless transitioning between 2-inch and 1.25-inch eyepieces. This adaptability ensures compatibility with a wide range of eyepieces, expanding your observational capabilities and maximizing the use of your telescope's accessories. Scratch Proof: To ensure durability and long-lasting use, the diagonal adapter prism is equipped with a metal gasket. This design feature prevents the prism from being scratched by screws during installation and use, maintaining its pristine optical quality over time. With the 90° Diagonal Zenith Mirror, transform your telescope into a powerful tool for exploring the universe. Its combination of superior optics, versatile functionality, and durable design makes it an essential accessory for both novice and experienced astronomers. Enjoy clearer, more detailed views of the cosmos and beyond with this exceptional diagonal prism.