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D70mm achromatic lens designed for DIY astronomical telescopes, ensuring clear and sharp images. Features a focal length of 400 mm and covered with a blue adhesive film for better light transmission and reduced chromatic aberration. Easy to assemble: the thin side of the lens must face the object, while the thickest side should face the lens tube for optimal performance. Compatible with various telescope models, making it a versatile choice for astronomy enthusiasts and enthusiasts. Each package includes 1 piece lens, perfect for upgrading or building your own telescope setup.