203mm parabolic primary mirror devised for Newtonian reflectors, ensuring optimal light collection and clarity. Includes a 70mm secondary lens, coated with aluminum film for enhanced durability and scratch resistance. Precision focal length of 750mm with an accuracy of 1/6λ, perfect for amateur astronomers seeking high performance. Features a central mark for easy optical calibration, compatible with both eyepiece and machine calibration tools. Ideal for DIY enthusiasts looking to build or upgrade their own astronomical telescopes with reliable components.