Double Separation Lens for 90mm Refractive Astronomical Telescope (1 piece) - Multilayer Processing Improved Image (D90F900 Flued Objective Lens)

90mm diameter lens: designed specifically for refractive astronomical telescopes, ensuring superior clarity and performance. Multiple focal length options: Choose from 500mm, 900mm or 1000mm focal lengths to meet your astronomical observation needs. Advanced multi-layer coating: available in green or blue version, improving light transmission and reducing glare for an optimal viewing experience. Precision Engineering: With a diameter tolerance of +0/-0.12mm and a focal length tolerance of ±0.1%, our lenses are designed for optimum accuracy and reliability. Versatile use: Ideal for telescope lenses and collimation lenses, perfect for amateur astronomers and professionals alike.