1. 45Degree Erect Image: This diagonal mirror features a 45degree angle, providing a very simple and comfortable viewing experience through your telescope, for astronomical observations and astrophotography. 2. Quality Optical Lens: Equipped with a 1.25inch optical lens, this mirror ensures sharp and clear images, making it ideal for both amateur and professional astronomers seeking quality visual performance and imaging. 3. Dust Protection: The included dust cover protects the lens from dust, dirt, and moisture when not in use, extending the lifespan and reducing the need for cleaning optical components for a better viewing experience. 4. Ideal for Astrophotography: This diagonal mirror is designed to enhance visual clarity and image stability. It is for capturing astronomical images, whether for casual stargazing or more serious astrophotography.