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[ATM] HELP ME FOR GREGORIAN TELESCOPE

To: atm@atmlist.net
Subject: [ATM] HELP ME FOR GREGORIAN TELESCOPE
From: seyyed mahmoud ghasemi <modeler72@yahoo.com>
Date: Wed, 8 Aug 2007 01:02:56 -0700 (PDT)
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DEAR SIR ,
   
  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 ) ?
   
  MANY THANKS 
  S.M.GHASEMI

       
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