1 x 90mm Refractive Astronomical Telescope Double Separation Lens - Multi-Coated Available (D90F900 Blue Film)

Optical: The D90mm dual separation lens delivers outstanding images with a combined classification 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 meet your specific astronomical observation needs, enhancing your star-watching experience. MULTILAYER COATING - Available in 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 DIY ASSEMBLY - Designed to be compatible with various astronomical telescopes, this lens set allows for easy assembly, making it perfect for both amateur and experienced astronomers.