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)