Re: [ATM] suggestions wanted for 6 inch optical window

[Jarvis Krumbein <jkoptic@juno.com>]

Gil, the 3/8 thick filter will ;probably be your best bet.  If ir was
manufactured as a filter it should be of good enough optical quality. 
Being the less expensive of the two choices doesn't hurt either.  Yes,
you can glue to the inside surface and the greater thickness of the
filter should help there.  Use a silicon adhesive such as are used for
fish tanks.

Good luck,

Jarvis Krumbein

On Sat, 17 Mar 2007 12:58:31 -0700 (PDT) Gil McFarlane
<gilboastro@yahoo.com> writes:
> I want to try putting an optical window at the front end of my 5" 
> f11.6 scope (I missed f12 by a few inches - oops).  I am thinking of 
> buying one or the following and then testing them/correcting them 
> rather than starting from scratch from a more expensive raw blank.  
> Plus, if I'm lucky, I may just need to polish it a little.
>    
>   One is a little thicker than the other:  3/8" vs. 6mm (about 
> 1/4").  One is "optical glass" the other is "BK7".  The cost 
> difference is not enough to worry about.  
>    
>   1.  Are either of these thick enough for a window (that will be 
> supporting the secondary too)?  
>    
>   2.  Is it possible to simply glue to the inside surface rather 
> than cutting a hole through?
>    
>    
>   Thanks, Gil
>   the glass is at:
>    
>   http://www.surplusshed.com/pages/item/pm1077.html
>    
>   http://www.surplusshed.com/pages/item/m1432.html
>    
>    
> 
>  
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