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Re: [ATM] 8" F/4.2 progress

Thanks John..  I was starting to think that I just did not have the 
knack to using the mask.  Then all of a sudden it came to me..  it's a 
sphere! :)

Jason

John Sherman wrote:

>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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"A long journey starts with the first step and an understanding spouse."
http://www.undermidnight.com - astronomy and astrophotography
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