[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
Re: [ATM] Collimating mechanisms
On Sun August 14 2005 3:05 pm, Mel Bartels wrote:
> > far as collimation is concerned, I think the result is the same.
I don't think I'm getting something here. IIUC we are considering a string
scope, with 3 poles as "spreaders" to keep the strings in tension. Seems to
me if you lengthen one of the poles, you are tilting the upper ring, not
moving it laterally. So the primary still needs to be collimated to aim at
the secondary, right? And the focuser moves with the secondary, so the
secondary still needs to be tilted in its holder, right?
Now, if you have a cage, and tilt the lower ring, the secondary would tilt
*and* move laterally, but not independently, which would make for
heartbreakingly iterative collimation?
So, how does altering the pole length help collimate the scope?
--
Michael Lindner
http://www.starastronomy.org *** http://home.att.net/~mikel
http://www.atmsite.org *** http://www.atmlist.net
_______________________________________________
ATM mailing list http://www.atmlist.net/