you need to learn something about optical systems. You are wildly off!
sorry -

jerry



Thomas M wrote:

"David Knisely" wrote in message
...
Thomas M wrote:

I thought the SCT principle was much younger than that...its an F6 SCT
in
the article

The reflector in the article is not an SCT. It is a simple Cassegrain,
possibly Classical or Gregorian, as the Gregorians were often resorted to
during the era of the "brass" telescope (the tube length argues for a
Gregorian). The SCT is a different and much more recent design (circa
1962)
using spherical optics and a large corrector plate. Clear skies to you.
--


Some of you have a real bad habit of splitting hairs...the concept or
priciple is the same!