Making a 300mm f/d 4.6 mirror for new telescope



Grinding the mirror with carbo 60




the pitch polishing lap on the work post



pressing the tool on the mirror



the couder screen



The foucault test apparatus


After many hours of work, the result:


max error=lambda/12, transverse aberration < 0.71 and no astigmatism.



For most informations about mirror making, read the very good book : How to make a telescope by Jean Texereau ( a french book translated in english)