Elevate your astronomical observations with this precision-crafted Air-Spaced Achromatic Doublet Lens. Featuring an impressive 85mm diameter and 900mm focal length, this lens is specifically designed for astronomical telescopes. The air-spaced doublet design ensures superior optical performance by minimizing chromatic aberration, delivering clearer and sharper celestial views. The lens comes with a robust mounting system that provides stable positioning for optimal viewing experiences. Measuring 8.5 cm in width and 1.5 cm in both height and depth, this compact yet powerful lens is manufactured with high-quality optical materials. The manual focus capability allows for precise adjustments to achieve the perfect image clarity. This versatile lens is compatible with various astronomical telescope setups, making it an essential component for both amateur astronomers and experienced stargazers. Each unit comes carefully packaged to ensure safe delivery of this delicate optical instrument.