High-precision D114F450 parabolic reflector lens devised for DIY astronomical telescopes, ensuring optimal performance and clarity. Features a 114mm caliber and 450mm focal length with a focal ratio of 3.95, perfect for amateur astronomers and enthusiasts. Constructed with an aluminum film coating for durability and enhanced reflection, providing superior image . Includes options for primary and secondary mirrors, allowing for customizable setups to meet your specific observational needs. Easy maintenance instructions included: safely clean the mirror surface with materials to maintain optimal performance and longevity.