Re: Intermediate ATM project

[epabcc@epa.ericsson.se (Bratislav Curcic)]

> Anyone for a Pressmann-Carmichael ??

NO !!!!

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.

Bratislav