Achromatic D40 lens designed for self-built refractive telescopes, ensuring clear and sharp images. It has an effective diameter of 40mm and a focal length of 205mm, perfect for amateur astronomers and telescope enthusiasts. Coated with a blue adhesive film, this lens minimizes chromatic aberration for a better viewing experience. EASY TO ASSEMBLE - Follow the mounting precautions by placing the thin side of the lens towards the scene for optimal performance. Ideal for DIY projects and telescope upgrades, this lens is a must have accessory for anyone looking to improve their astronomical observations.
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