On Mon, 31 Jul 2006 20:29:56 GMT, "W. Watson"
wrote:

My understanding of the focus knob found on SCTs (all?) is that it is
attached to a long screw thet is on the back of the mirror. It would seem to
me that if one turns the screw CC that it would pull the mirror toward the
observer; thereby moving the focal point of the mirror inward. I tried this
with a 4" Meade SCT, and the focal point moves outward? Perhaps this depends
on where one things the head of a typical screw is in the device. I would
guess it essentially be where the focus knob is located. Can anyone clear
this up?

The mirror is attached to a fitting that runs up and down the threaded
rod. When you turn the knob clockwise the mirror moves to the back of
the telescope and when you turn the knob counterclockwise the mirror
moves to the front of the telescope.

--
The night is just the shadow of the Earth.