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D70mm achromatic lens designed for DIY astronomical telescopes, ensuring clear and sharp images. Featuring a focal length of 400mm and covered with a blue adhesive film, improving light transmission and reducing chromatic aberration. EASY TO ASSEMBLE - Simply position the thinnest side of the lens towards the object and the thickest side towards the lens tube. Compatible with various telescope models, making it a versatile choice for astronomy enthusiasts and enthusiasts. Each package includes 1 piece of lens lens, perfect for upgrading your telescope or building a new one.