Hi all, great work everyone! Can't wait to see some of the results at the Queensland star fest, maybe. I obtained a secondary for the now 18" primary from Bintel, they had a diagonal for a 16" f4.5 with enough width to make 20% ratio with main mirror at f4.7. I love the idea of a sphere to test secondary mirrors, I guess as a null test, so might order some glass from Sydney Glass Co. What diameter would I need.
We all seem to be having problems with the outer edge, me too as the 18" started life as 19", but had to give up as the mirror got too thin for comfort to grind it again, anyway it's ok as there isn't much extra weight to carry around. Good luck everyone with your projects.
Cheers, Frank
