1 Double Separation Objective Lens for 90mm Refractor Astronomical Telescope - Multilayer Coating Available(D90F500 Broadband Film)

Optics: The D90mm dual-spaced objective lens delivers exceptional image with a combined rating of 1/4-1/8, ensuring clear and accurate astronomical observations. Versatile focal length options: Choose from three focal lengths (500mm, 650mm or 1000mm) to suit your specific astronomical observation needs, thus enhancing your stargazing experience. Multi-layer coating: Available with green or blue multi-layer coatings, these lenses minimize light reflection and maximize light transmission for brighter, sharper images. Precision engineering: With strict tolerances for diameter (+0/-0.12mm), center thickness (±0.2mm), and focal length (±0.1%), these lenses are designed for optimal performance in refractive telescopes. EASY MOUNTING - Designed to be compatible with various astronomical telescopes, this lens set allows for simple mounting, making it perfect for both amateur and experienced astronomers.