D70mm achromatic objective lens devised for DIY astronomical telescopes, ensuring clear and sharp images. Available in multiple focal lengths: 400mm with adhesive blue film, 280mm with adhesive green film, and 330mm with standard adhesive film. Actual diameter of 73mm, providing a perfect fit for various telescope models and enhancing your stargazing experience. Easy assembly with clear instructions: thin side of the lens faces the object, while the thick side faces the lens tube for optimal performance. 1 piece per package, ideal for hobbyists and professionals looking to upgrade or build their own telescope for astronomical observations.
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