[Satchmo]

Originally Posted by alpal

I thought that ion milling obtained 1/100th wave performance?

http://www.rcopticalsystems.com/tele...n_milling.html

Thats nice advertising about what Ion milling is capable of in a research situation .

Have a look at the link on that page showing final ion milled results of an RC 24" - P-V is 1/10 wave - this would probably have been around 1/4 wave if only rotational symmetric polishing had been carried out ( easy enough to do with pitch polishing )