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60mm diameter objective lens devised for DIY refracting astronomical telescopes, enhancing your stargazing experience. Available focal lengths of 300mm to 900mm, allowing for versatile use in various telescope setups. Features all-sided green film coating for improved 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 telescope objectives and star finders.