D40 achromatic objective lens devised for self-made refractive telescopes, providing clear and sharp images. Features a 40mm actual diameter and a 205mm focal length, perfect for amateur astronomers looking to enhance their telescope performance. Coated with adhesive blue film for improved light transmission and reduced chromatic aberration, ensuring vibrant and accurate color representation. Easy to assemble with clear instructions; ensure the thin side faces the scene for optimal viewing results. Compatible with various telescope models; ideal for DIY enthusiasts and astronomy lovers seeking to build or upgrade their own telescopes.
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