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Re: (IAAC) Obj: 11 Scorpio - Inst: Orion 6" dobsonian



>Hi William,
>	Just curious, what is a hex mask and how does it
>help?
>Mark
>
Basically, a hex mask is a mask cut to fit your aperature with an 
hexagonal open slightly cmaller that the aperature cut into it. This 
breaks up the difraction disk into 6 spikes and then you can rotate 
the mask so the secondary lies between 2 of these. See 
http://whuyss.tripod.com/33.html, click on "selected articles", then 
"Who was that masked double" By the way, you may want to join out 33 
group if you are at all interested in double stars.
William
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