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Re: [ATM] Nasmyth secondary mirror cell ?



> Do what you can to keep your central obstruction close to or below 25%.
> You're putting in a tremendous effort, you shouldn't give up contrast ...
>
> Clear Skies,
>
>      Chuck

I have been figuring obstruction percent on area not radius. By area it is
13.22%, by radius or diameter it is 36.36%.  Which is correct?

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