D40 achromatic objective lens designed for homemade refractor telescopes, which ensures clear and sharp images. Features an actual 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 visual experience. Easy to assemble: Follow assembly precautions by placing the thin side of the lens toward 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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