D40 achromatic objective lens designed for self-made refractive astronomical telescopes, ensuring clear and sharp images. It has an actual diameter of 40mm and a focal length of 205mm, perfect for enhancing the optical performance of your telescope. Coated with a blue adhesive film, this lens minimizes chromatic aberration and improves light transmission for a better viewing experience. Easy to assemble with clear instructions; make sure the thin side faces the scene for optimal results. Ideal for astronomy enthusiasts and DIYers looking to build or upgrade their own telescope with premium optical components.
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