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Old 23-11-2013, 09:09 AM
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alpal is offline
Join Date: Jan 2012
Location: Melbourne
Posts: 2,968
Originally Posted by Satchmo View Post
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 )

Actually here:

it says:
RMS = 0.024 ( = 1/42 wave )
Peak to valley = 0.1 wave

Remembering that the reflected wave is only half that value.

Still - I think it's a pity that RCOS went out of business.
Maybe ion milled optic telescopes will become collectors items?
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