[ATM] HELP ME FOR GREGORIAN TELESCOPE

[Hugues.Laroche@ses-astra.com]

Hi Seyyed, 

>IF I WANT TO  MAKE A  8" GERIGORIAN TELESCOPE , WOULD YOU PLEASE ADVISE 
WHEN SHOULD I  MAKE  A  HOLE  IN MIDDLE OF  >PRIMARY MIRROR ( WHICH 
TRANFER THE RAYS  FROM THE SECONDARY MIRROR TO  EYEPIECE ) ?

I think you should be a little more explicit in order to receive precise 
advices:
do you already have a terminated primary mirror?

I assume that no. Then you should make the hole as soon as possible
and consult sites of ATM's who have made cassegrainian or gregorians, so 
as
to do it alright. Then you make the primary... which you can test as a 
newtonian
if your goal is a classical gregorian.
The secondary will come after...

HL



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