Re: [ATM] Posible variation on the Cassegrain secondary

["vladimir sacek" <vla@toast.net>]

Jim Burrows wrote:

>...without the restriction, 429 nm
> with back focus 413 mm.

If the design bfl is ~300mm, that is quite a bit of
secondary ROC deviation (~10% or somewhat more).
As someone with zero hands-on experience, I wonder
what makes controlling the ROC to within a couple of percent during the 
figuring difficult?

Vlad 

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