1pc 90mm Double Separation Objective Lenses for Refractive Astronomical Telescopes(D90F1000 Blue Film)

Premium 90mm double separation objective lenses devised for refractive astronomical telescopes, enhancing your stargazing experience. Available in various focal lengths: 500mm, 650mm, 900mm, and 1000mm, providing versatility for different astronomical observations. Features coatings (green and blue film) that improve light transmission and image clarity, ensuring stunning visuals. Precision-engineered with tolerances for diameter, center thickness, and focal length, ensuring optimal performance and image . Ideal for DIY telescope assembly, these lenses are perfect for both objective and collimating applications, making them a must-have for astronomy enthusiasts.