Feature●Newton Reflective Sphere Mirror D76F360mm Astronomical Telescope Primary Mirror with 20mm Secondary Mirror●The D76F360 primary lens is made of K9 glass, the actual diameter is 78mm, the focal length is about 300mm, the secondary lens is 20mm, the surface is coated with aluminumDescription
The D76F360 primary lens is made of K9 glass, the actual diameter is 78mm, the focal length is about 300mm, the secondary lens is 20mm, the surface is coated with aluminum.