Re: Simple telescope design question

From: Robert Maxwell Robinson (max_at_u.washington.edu)
Date: 06/28/04 

Date: Mon, 28 Jun 2004 15:42:00 -0700

Thanks for your help; I'll look at websites on solar scopes. The idea
that large, flat mirrors are harder to make than large parabolic
mirrors sounds *way* strange to me; I thought you practically started
with the one to make the other!

One comment I was going to make was that I don't think the large
"flat" mirror would need to be nearly as flat as the flat secondary of
a standard Newtonian, since the flat secondary is put at a place where
the image is already highly magnified.

At any rate, I'd like a second opinion about how much trouble the flat
mirror would cause in this design.

On Mon, 28 Jun 2004, Chris Rowland wrote:

|I don't know much about this but as that doesn't stop anyone else;-)
|
Myself included.

|Large flat mirrors are much more difficult to make than parabolic
|mirrors. This is probably the principle objection to this idea.
|
|However scopes are made with this sort of arangement, particularly
|solar scopes.
|
|Another advantage is that the scope can be fixed and only the flat
|miror moved to aim at and track objects.
|
|Chris

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