Achromatic D40 lens designed for self-built refractive telescopes, ensuring clear and precise astronomical observations. It has an effective diameter of 40mm and a focal length of 205mm, optimized for better light transmission and reduced chromatic aberration. Coated with blue adhesive film, ensuring excellent durability and protection while maintaining optimal optical performance. Easy to assemble; simply place the thin side 'lens towards the scene for accurate alignment and clarity. Perfect for astronomy enthusiasts and hobbyists looking to build or upgrade their telescopes with high quality optical components.
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