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Primary parabolic mirror 203 mm designed for Newtonian reflectors, which guarantees optimal light collection and optimal clarity. Includes a 70mm secondary lens, coated with aluminium film for durability and scratch resistance. Precision focal length of 750mm with 1/6λ accuracy, perfect for amateur astronomers looking for high performance. Features a center mark for easy optical calibration, compatible with both eyepiece and machine calibration instruments. Ideal for DIY enthusiasts looking to build or upgrade their astronomical telescopes with reliable components.