Dual separation lens designed for refractive astronomical telescopes, enhancing your stargazing experience. Available in multiple focal lengths (500mm, 650mm, 1000mm) to meet various observation needs and preferences. Precision-built, with a diameter tolerance of +0/-0.12mm and ±0.1% focal length tolerance for optimal performance. Coated with optional green or blue multilayer broadband film to improve light transmission and image clarity. The package includes a 90mm lens, perfect for DIY telescope assembly and upgrades for astronomy enthusiasts.
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