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Achromatic D40 objective lens for DIY refraction telescopes that delivers clear and sharp images. Features an actual diameter of 40 mm and a focal length of 205 mm, perfect for amateur astronomers who want to improve the performance of their telescope. Coated with a self-adhesive blue film for improved light transmission and reduced chromatic aberration, ensuring vibrant and accurate colour representation. Easy to assemble with clear instructions; make sure the thin side faces the scene for optimal viewing results. Compatible with various telescopic models; ideal for DIY enthusiasts and astronomy lovers who want to build or upgrade their own telescopes.