Re: [APML] Cassegrain notes

[Chuck Vaughn <aa6g@aa6g.org>]

Tony,

> The Classical Cass is a tiny bit more forgiving.If you are going to choose
> between the two and don't want to use any accessory glass, perhaps the
> Classical route is a better choice. Kim Zussman helped me a lot with this
> choice... he checked all this out very carefully before building his... he has
> a friend named Greg who is a professional optician... much of this info and
> the baffle design is thanks to his generous help.

What is the radius of curvature of the focal plane of your cassegrain? It is
14.6" for my RC.

The RC is not more difficult to collimate than an equivalent classical
cassegrain. They're essentially the same telescope with different curves
on the mirrors. This myth has been perpetuated by people who are unable to
grasp what is necessary to get a scope collimated. It's not easy to get
good collimation across the film plane but this is true of any two mirror
scope where the mirrors are completely adjustable.

Chuck


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