> As concerning to difficulties to make the first scope with f/4-f/5 mirror...
> It depends on your overall skill. Some mounths ago I help a guy to build his
> first scope. It's a 8" Cassegrain with f/3 primary
> So, you may choose the same optical scheme for your telescope but keep f/4 for
> primary mirror. This will reduce difficulties of parabolization of the mirror.
An f/4 to f/5 as a beginner's scope ? Even better : a Cassegrain telescope with an f/3 primary !!??? You must have some VERY talented beginners there ... I'm impressed !!!!
(It took ME almost 20 years to get courage to attack f/3.3 oblate spheroid with SC of 2.56 needed for Wright; and I am STILL reluctant to make anything faster than f/5 ... what a shame!)
Bratislav