Achromatic objective lens designed for self-made refractive telescopes, ensuring clear and sharp images. It has an actual diameter of 40mm and a focal length of 205mm, perfect for amateur astronomers and telescope enthusiasts. Coated with a blue adhesive film to improve light transmission and reduce glare, enhancing your stargazing experience. Easy to assemble with clear instructions; simply align the thin side of the lens towards the scene for optimal performance. Compatible with various DIY telescope models, making it a versatile addition to your astronomical tool kit.
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