<ul><li>For DIY Telescope Spherical Concave Mirror D130F650mm Optical Spherical Glass</li><li>Aperture: 130mm, focal length: 650mm</li><li>D130 F650 Reflecting objective Set, The Main Mirror is Spherical, aluminized And Protective Film, And The Secondary mirror is Elliptical Plane</li><li>The short axis of the secondary mirror is 25mm, which is a good choice for the fans of DIY telescope.</li><li>Pack include:Primary Mirror + Secondary Mirror Set</li></ul><br><br>Used:Cleaning the mirror surface: first blow off the dust that can be blown off with a blown balloon,<br>then use a good quality absorbent cotton to dip the alcohol and gently wipe the mirror.<br>After drying, look at the light source from the side to see if there is some cotton or Keep the water stains on top, and if necessary, gently wipe them with some good quality mirror cloth (be careful, otherwise it will affect your telescope)

CYZW D130F650 Telescope Accessories Reflector Spherical Primary Mirror + Secondary Mirror DIY Astronomical Telescope Mirror Set (by DHL)