Re: ATMing in the September Sky & Telescope

[Gary Seronik <gseronik@netway.com>]

Hi Dan:

At 01:02 PM 7/18/1999 +0100, Daniel Fundo wrote:
>
>Gary,  I have heard of the Mersenne design before, but I thought it was
>an afocal Cassegrain arrangement.

It can be, but Clyde has done something quite interesting. Using a pair of
flats, he sends the light out the side of the scope along the altitude axis
and into a refractor.  With his arrangement, the eyepiece's altitude
position is stationary.  It's a joy to use.  You simply sit in the chair
and observe - very comfortable.

Gary