Re: ATM Stripped Down eyepiece

[George Anderson <georgea@cam.org>]

Marco

Try two 35mm binocular objectives mounted back to back with a slight
airspace between them. It is essentialy a kellner (IIRC) and should give
good views for a finder. The fl may be slightly longer than your
requested 40mm.

George Anderson
Montreal Canada

Clear skies and good health

Marco Miglionico wrote:
> 
> Hello List.
> 
> I have recently found a source of inexpensive 4in newt. mirrors
> with 1in diagonals. The F.L. is 865mm (F8.65).
> 
> I want to use this as a finder, with a 40mm Plossl, but don't want the
> weight of the 40mm eyepiece. The finder won't even have a focuser.
> SO does anyone know of plans for a commercial 40mm plossl that has
> been stripped down to a bare minimum, or know of any commercial eyepieces
> that can be modified in this way?
> 
> Thanks,
> 
> Marco Miglionico.