Re: ATM Berry dimension modifications for 8"

[Mike Coslo <mjc5@psu.edu>]

Adam Perkins wrote:
> 
> --- Shannon Hughes <sr.hughes@worldnet.att.net> wrote:
> >
> 
> >
> > I also have not decided whether I will make the
> > focuser or buy it. Has
> > anyone had success with Orion's R&P or Helica
> > focusers shown on their TM
> > pages? Any other good recommendations?
> >
> > --Shannon Hughes
> >
> 
> Hi
> 
> I bought Orion's 1.25" helical focuser for my first ATM project.  I
> was not impressed with its wobbly and sticky action.  The tensioning >screw idea is not 
>a good one here, although it works if you constantly
> fiddle with it.

        I also did not care for the helical focuser I got from them. The same
reasons as yours, plus the thing was a pain to focus. It took too long.
I replaced it with a Crayford focuser and it it now a joy to use.

        A helical focuser *might* be a good choice with a very fast scope.

        - Mike -