1. The company is committed to optical spherical lenses, optical prisms, reflectors, achromatic lenses, cemented lenses, cylindrical lenses, windows and other optical components can be designed according to requirements, providing you with the best products and services is our aim2. The main mirror is made of K9 glass with a diameter of 135mm, and the focal length is about 650mm3. The minor axis (short side diameter) of the secondary mirror is 35mm, spherical mirror, aluminized and protective film4. Suitable for adult telescope, children's telescope, astronomical beginner telescope, children's beginner telescope, children's telescope toy, astronomical telescope, telescope personnel, adult travel telescope5. Based on the feedback from my friends, you can shoot a few planets.6. Independent product packaging brings you a different shopping experience7. This is an attached area for astronomical telescope lovers, you can buy it as you need8. Used as an accessory for astronomical telescopes