D70mm achromatic objective lens devised for DIY astronomical telescopes, ensuring clear and sharp images. Available in three focal lengths: 280mm, 300mm, and 400mm, allowing for versatile viewing options for stargazers. Features a coated adhesive blue or green film for enhanced light transmission and reduced chromatic aberration. Easy to assemble with clear instructions: thin side of the lens faces the object, thick side towards the lens tube. Perfect for astronomy enthusiasts looking to build or upgrade their telescopes with reliable optical components.
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