Achromatic D40 lens designed for self-built refractive telescopes, providing clear and sharp images. It has an effective diameter of 40mm and a focal length of 205mm, perfect for astrophiles looking to improve the performance of their telescope. Coated with blue adhesive film for better light transmission and reduced chromatic aberration, ensuring vibrant and accurate colour representation. Easy to assemble with clear instructions; make sure the thin side is facing the scene for optimal viewing results. Compatible with various telescope models; ideal for DIY enthusiasts and astronomy lovers looking to build or upgrade their telescopes.
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