Telescope Reflector Mirror D114mm F900mm with Secondary Mirror, for DIY Astronomical Telescope

• Contains a primary lens with an objective lens diameter of 114mm and a focal length of 900mm, and a secondary mirror with a short axis 25mm length. This is the core component of a set of mirrors.
• The main mirror is a spherical mirror with aluminized surface and a protective film to prevent scratches on the main mirror under light touch.
• Compared with cheap telescopes on the market, this primary mirror has a diameter of 114mm and a large-aperture optical glass with a focal length of 900mm, which can see farther, and the focal length is as high as 900mm, which can significantly reduce the imaging failure caused by spherical aberration. Real, greatly improved the experience, this is a professional DIY telescope lens set.