Achromatic D70mm lens designed for DIY astronomical telescopes to ensure clear and sharp images. Available in multiple focal lengths: 400mm with blue adhesive film, 280mm with green adhesive film and 330mm with standard adhesive film. The actual diameter is 73 mm, which provides a perfect fit for different telescopic models and improves your star watching experience. Easy to install with clear instructions: the thin side of the lens points for object, while the thick side shows for lens barrel to achieve optimal performance. 1 piece per pack, ideal for hobbyists and professionals who want to upgrade or build their own telescope for astronomical observation.
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