Re: ATM Thanks and Nasmyth Dobs

[Bernard Maugoust <maugoust@free.fr>]

Hi Gordon,

In message <3F7A3C59.90200@shaw.ca>, 
 Gordon Tulloch <gtulloch@shaw.ca> wrote:

[snip]
> 
> With the discussion lately regarding Nasmyth fixed eyepiece designs, 
> it's gotten me thinking again about a Nasmyth-Cassegrain design for a 
> large (24" or so) dob that can be used without a ladder - I checked the 
> archives and a few people seemed to be working on examples of this 
> design but I didn't see any web pages, does anyone have any links to 
> examples?

I'm making slooow progress with my 8" Nasmyth-Cassegrain Dob, and have
nothing to show on a web page yet either :-(

Oddly enough I stumbled on this particular design over 12 years ago, simply
because I didn't want to pierce the main mirror. My back being in the state
it is now, I'm glad I took this early decision.

Of course, it's even more to the point with larger dishes, but not be
rejected off hand for modestly sized scopes.

Have you laid out the rough specs for your project? Cassegrain isn't exactly
for low magnifications, what would you pick for a 24"?

Cheers,

Bernard

-- 
Bernard Maugoust 3°59'E 44°28'N