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D60mm double separated multilayer objective lens devised specifically for DIY refracting astronomical telescopes. Compatible with various focal lengths: 300, 360, 400, 500, 600, 700, 800, and 900 mm, allowing for versatile astronomical observations. Features all-sided green film coating for enhanced light transmission and reduced glare, ensuring clear and bright images. Precision-engineered with a diameter tolerance of +0/-0.12mm and focal length tolerance of ±0.1% for optimal performance. Includes two refraction double separation objective sets, perfect for both astronomical telescope objectives and star finders.