- Compatibility: Designed specifically for 1.25 inch eyepieces and telescopic focusers, this dielectric mirror star diagonal is the perfect fit for your telescope setup. - Optimal Application: This diagonal adapter is ideal for refractor and catadioptric telescopes, ensuring enhanced image quality and functionality. Note: It is not compatible with mirror telescopes. - User-Friendly Design: With a convenient 90-degree angle, this diagonal allows for comfortable viewing. You can easily observe celestial objects without straining your neck, even when positioned at awkward angles. - Simple Installation: Installation is straightforward—just insert the silver end into your 1.25 inch telescope, attach your eyepiece at the other end, and secure it with the provided screw. No complex setup required. - Use Cases: 1. Perfect for stargazing sessions, allowing for easy and comfortable viewing of stars and planets through refractor telescopes. 2. Ideal for astrophotography, providing a reliable optical path for capturing clear images of celestial objects. 3. Great for educational purposes, making it easy for students and enthusiasts to observe and learn about astronomy in a comfortable manner. - Durable Construction: Made with high-quality materials that ensure durability and optimal performance, allowing you to enjoy long nights of stargazing without worry.