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Re: [ATM] 16" RCC primary



--- Attila Schné <yolo@chello.hu> wrote:

> Hello Everyone,
> 
> 
>       I started a RCC project some month ago.The
> system includes a 16 f/4
> primary, which is right now at the state of
> paraboloid. But this
> system needs an hyperboloid primary.
> I don't want to make a Hindle sphere,
>       so I need another method to figure out when
> will be arrived the
>       desired hyperboloid shape. Do you have any
> ideas???????????????

You could make/refigure a bought lens into a Ross null
lens and test the primary by itself.For that matter
you could make the RC secondary into a Ross lens,use
it to figure the primary and redo the secondary into
the needed hyperbolic by either using the flat or
interference test against the tool used to make the
secondary in the first place.

Ric


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