This professional-grade DIY accessory for astronomical telescopes features a refracting optical design, equipped with a 60mm high-precision objective lens and a 700mm long focal length optical system, compatible with the 70500 lens set. Adopting multi-layer coating technology, it effectively reduces light reflection loss, enhances light transmittance, and improves imaging clarity. Ideal for both night-time astronomical observation—such as viewing lunar craters and planetary surface details—and daytime landscape viewing, it reveals fine textures of distant objects with remarkable precision. The lens comes with a metal barrel and a standard M42 threaded interface, perfectly adapting to mainstream telescope bodies to meet the needs of astronomy enthusiasts for self-assembly and equipment upgrading.