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Re: [ATM] Posible variation on the Cassegrain secondary

Jim Burrows wrote:

>The main problem is that both 
the ROC and the conic constant are specified to match the finished 
primary.<

Relatively small deviations in the secondary conic or ROC can be 
compensated by a slight change in mirror separation, keeping both 
spherical aberration and coma practically cancelled. It would be 
much harder to go for the exact match with the separation fixed.

Vlad

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