Re: collimation
Bob Luffel (bobl@hpgrla.gr.hp.com)
Thu, 11 May 95 9:51:07 MDT
>
>
> >
> > I am dismayed when I rotate commonly available focusers on the market only
> > to discover that the 'aim' point on the diagonal circumscribes a circle,
> > instead of staying steady. Imagine adding a rotating upper section, or an
> > image rotator for CCD imaging on an altaz to that! What a nightmare! It
> > was a lot of years before I stopped assuming (as many others must continue
> > to do now) that attaching a focuser meant that the focuser was automatically
> > aimed at the diagonal center. A lot of commercial scopes that I see don't
> > have the focuser aimed properly. So, this is an area that I think needs
> > more attention from discerning amateurs.
> >
> >
> > Mel Bartels
> >
> >
> >
> FYI the JMI focuser is one of the few commerical focusers that has set
> screws in the base so it can be adjusted to square it on.
> Bob Pfaff
>
AstroSystems focusers have always had this feature also.
Bob