Re: ATM astigamatism

["Frédéric Géa" <geaf@unionfinancieredefrance.fr>]

>I guess that you mean loss of collimation at different
>altitudes. Does using a much extensible medium like
>safety car belts not result in the same as having
>not rock solid fixations?

Yes, probably a close effect cause the mirror goes down when scope is aimed
low in the sky

>Regarding the piano wire option I thought you were using
>them _instead_ of a sling and not in conjunction with one?

Yes, I use the piano wire system an love it, no more movement of the optic.
It was only because Jan ask some details about sling.

Frédéric Géa
http://www.astrosurf.com/altaz