From: "Chris Feller" 
To: atm{at}shore.net
Reply-To: "Chris Feller" 


I am in the process of figuring an 8 inch sphere with a 1 inch hole in the center.
The figure is quite smooth but there is still a very subtle oblate spheroid present.
Using a 3 zone Couder mask the results are listed below

Zone I   0.097
Zone II  0.096
Zone III 0.095

My question is how good does the figure have to be to get good results. My
concern is that the more I work the mirror the more I risk making things
worse.
This is the third mirror I have made however I made the other two 15 years
ago so I am not very experienced.


Thanks Chris






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