<ul><li>Astronomical Telescope Reflective Telescope Secondary Mirror</li><li>The mirror is a spherical mirror with aluminized surface and a protective film to prevent scratches on the main mirror under light touch.</li><li>Dimension tolerance: 0.5mm</li><li>Surface accuracy PV: 1/4-1/6</li><li>Purpose: used as a Newtonian astronomical telescope optical axis steering</li></ul><br><br>Coating: Aluminium and protective film

Newtonian Reflector Telescope DIY Dedicated Secondary Mirror Elliptical for DIY Newtonian Reflecting Astronomical Telescope