90mm double separation objective lens devised for refractive astronomical telescopes, enhancing your stargazing experience. Available in three focal lengths: 500mm, 650mm, and 1000mm, allowing for versatile applications in astronomical observations. Features optional multi-layer coatings (green or blue film) to improve light transmission and image clarity for better viewing. Precision-engineered with tight tolerances: diameter tolerance of +0/-0.12mm and focal length tolerance of ±0.1% for optimal performance. Includes one complete lens assembly, ideal for DIY enthusiasts looking to upgrade or build their own astronomical telescope.
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