Achromatic objective lens devised for self-made refractive astronomical telescopes. Features a 40mm actual diameter and a focal length of 205mm, ensuring clear and sharp images. Coated with an adhesive blue film for enhanced light transmission and reduced glare. Easy to assemble; simply orient the thin side of the lens towards the scene for optimal performance. Perfect for astronomy enthusiasts looking to build or upgrade their own telescopes with reliable components.
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