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D60mm double separated multilayer objective lens devised specifically for DIY refracting astronomical telescopes. Versatile focal lengths available: 300, 360, 400, 500, 600, 700, 800, and 900 mm, allowing for customized viewing experiences. Features all-sided green film coating for enhanced image clarity and brightness, ensuring optimal stargazing and astronomical observations. Precision manufacturing with diameter tolerance of +0/-0.12mm and focal length tolerance of ±0.1% for reliable performance. Includes two refraction double separation objective sets, perfect for both telescope objectives and star finders, making it an ideal choice for astronomy enthusiasts.