My old 'scope was a Cosmos. The dew shield was a press fit on the
lens cell and the lenses were held in place with a plastic threaded
retainer that easily unscrewed.

I carefully removed the lenses; I had to insert a padded wood rod in
through the eyepiece side to push out the inner lens. I carefully
maintained the orientation of the lenses, then lost the orientations
when I cleaned them and blackened the edges. I seem to have been
fortunate in realigning the lenses as the image appears to be great,
at least on a terrestrial view. I will have to wait for a clear night
to try a star.

The lenses appear to be uncoated and the focuser is plastic, but the
telescope looks like a decent guide scope; well see how my software
likes the images.

Anyone know what a doublet is supposed to look like when assembled?
Are the flat edges/sides supposed to face the same direction or
outward (mine both face forward with the curved surfaces toward the
eyepiece)?

BH


> >
> >
> > I bought a very cheap (Chinese) 80mm scope to use as a guide scope.
> > The lenses are dirty, but the objective cell is glued on and will
> > require a painful extraction and some modification to do the cleaning.
> > I have no idea of how it might be collimated.
> >
> > The ST80 and Orion 80mm "guide scope" are both $119 for just the
> > optical tubes. I am wondering if I might invest over $119 worth of
> > effort to disassemble my old 80 mm tube and the new OTA might be
> > worthwhile.
> >
> > I also suspect that my cheapo might actually be a reject from the
> > Orion line and might only be an Orion in need of cleaning and
collimation.
> >
> > BH
> >
> >
>