From:     Filipe Silva 
To:        
Reply-To: Filipe Silva 


Goran & all,

I'll use a mask in my 6" mirror (actually a very convenient 6.2")
since my edges are somewhat chipped. This rough edge was caused when the
glass blank was cut at working temperature with some (rough) tool (at least
this is what I imagine). Beveling helped but some chips are too deep.
This introduces a question I have:
Since my mirror isn't perfectly circular (due also to the above) - how can
I calculate (in PLOP for example) the mirror cell supporting points? [I
know I'll have to use a 9 point support since the mirror is a bit thin
(15mm)]

Thoughts?

Best regards,
Filipe

http://pwp.netcabo.pt/lafey/ATM.htm


On Sun, 11 May 2003 17:44:10 +0100, Goran Hosinsky wrote:
>
>TE seems to be a mayor problem when making a mirror. Would it
>be a good idea to use a blank with10-20 mm bigger diameter then
>the target mirror and then use a mask in the telescope to shadow
>the edge of the mirror? This would also resolve the problem with
>diffraction from the mirror holding hooks.
>Goran
>
>

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