Re: ATM 3" 75mm or 4" 100mm eyepieces

[PFAFF2@delphi.com]

>  >
> >I'm not sure exactly why you would want that long a focal length.  But the
> >design objectives for a scope are different than for an eyepiece ... in
>  
Dumb thought:
have you looked into the possibility of making a focal reducer.
These seem to work ok on SCT's. Maybe you can find a stock lens
from a supplier that might work.

Also check out A Field Extender (Reverse Barlow)  by Ralph K. Dakin
in Advanced Telescope Making Techniques Vol 2.
The article describes a 0.6x extender. Or a f8 scopes becomes a f4.8.

Bob Pfaff