Re: [ATM] 25" mirror possibilities

[Hugues.Laroche@ses-astra.com]

Hi Jarvis and others...

>At the time he wasn't talking about a super
>fast primary but was going to be content 
>with an f3 or there about. 

About 3-4 years ago I had seriously envisaged about this
setup. 26" f/??, 1" flat secondary, 10" (oversized) f/1.4 tertiary.
I wisely started with the tertiary (keeping the 26" in reserve
for a newtonian in case of failure) then finally gave up.
One day maybe...

The aplanatic gregorian has the advantage to be allow to null
test the primary and tertiary. 

Hugues
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