D203F750 Telescope Accessories Reflector Spherical Primary Mirror + Secondary Mirror DIY Astronomical Telescope Mirror SetTelescope D203 F750 Reflective Objective Mirror Main Mirror 203mm caliber, 750mm focal length How to useCleaning the mirror surface: first blow off the dust that can be blown off with a blown balloon, then use a good quality absorbent cotton to dip the alcohol and gently wipe the mirror. 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
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