1pcs 90mm Refractive Astronomical Telescope Double Separation Objective Lens - Multi-layer Coating for Enhanced Image(D90F900 Flued Objective Lens)

90mm Diameter Objective Lens: devised specifically for refractive astronomical telescopes, ensuring superior clarity and performance. Multiple Focal Length Options: Choose from 500mm, 900mm, or 1000mm focal lengths to suit your astronomical observation needs. Advanced Multi-layer Coating: Available in green or blue film options, enhancing light transmission and reducing glare for optimal viewing experiences. Precision Engineering: With a diameter tolerance of +0/-0.12mm and focal length tolerance of ±0.1%, our lenses are crafted for accuracy and reliability. Versatile Use: Ideal for both objective and collimating lenses in telescopes, perfect for amateur astronomers and professionals alike.