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Re: [ATM] Minimum inner tube diameter



Stathis Kafalis wrote:

>For which maximum field do you people size the secondary ring and why?
>
>  
>
I use the mirror diameter + 46 mm (or one field stop of maximum size) 
method.  I don't want to suffer from any aperture stop-down loss with 
the widest possible field stop eyepieces.

Lawrence Sayre

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