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Re: [ATM] 8" F/4.2 progress

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Subject: Re: [ATM] 8" F/4.2 progress
From: "John Sherman" <atm@mail.johnspics.com>
Date: Wed, 26 Oct 2005 16:46:53 -0400
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Hi Jason, 

>I think I figured out why it is difficult for me to use 
>the couder mask: the entire mirror nulls out at once!   
>It took me a little bit to realize 
>that (I think I am right about this..) 

Yes, when you have a sphere, the entire mirror nulls at once. As you parabolize you will not be able to null the entire mirror at once from the ROC. You will get a gray circle (null) in the zone you're in. Then you will be able to use the mask to measure which zone. 

Have fun! 

John 



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