Re: [ATM] [atm] how to test flat secondary mirror

["Philip Lardner" <philiplardner@eircom.net>]

Apologies for replying so late to this thread, but I only just spotted it in
my growing backlog of unread ATM messages!

Have a look at my flat-pages at
http://ochra.110mb.com/Home%20Page/Astronomy%20&%20ATM/astronomy__atm.htm

I have to confess that I haven't done much work on finishing my flats in the
last few months - summer got in the way - but I hope to get back to it
shortly.

The biggest problem I ran into was ensuring that the two plates under test
were totally free of dust. The tiniest spec of dust was skewing my fringe
patterns so much that I could never get two readings the same. I haven't
really cracked that problem yet, so if you have any ideas then let me know!

Hope this helps,

	Phil. 

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
seyyed mahmoud ghasemi
Sent: 19 August 2007 06:13
To: atm@atmlist.net
Subject: [ATM] [atm] how to test flat secondary mirror

dear sirs,
   
  would you please guide me  how to make  and polish  a flat mirror  and how
to test ( if it is  exactly  flat ) for secondary mirror
   
  i appreciate your  guidance in advance
  faithfully yours,
   
  s.m.ghasemi

       
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