Re: Intermediate ATM project

[Brand <huntb@ucs.orst.edu>]

On Tue, 17 Sep 1996, Bratislav Curcic wrote:

> It has very steep aspheric secondary that you will find impossible to
> test without full fledged autocollimation setup. Apart form that, it
> has worst coma of all Cassegrain-like scopes. Stay away from it.  
> For long f/# visual scope, my vote goes to Dall-Kirkham. Easy to figure
> (and test) ellipse for primary, spherical secondary that can be
> interference tested against polished tool.

I don't mean to sound like a goon, but on the Dall-Kirkham are the 
primary and secondary both concave? If not, is there a type that has both 
primary and secondary concave?
And, I don't know very many of the different types of scopes, does 
everybody else have a book on it or something? If so, which book?

Thanks,
Brand
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