Re: ATM Must...avoid...helical...focuser..must...make...crayford

[PFAFF2@delphi.com (Robert C. Pfaff)]

>
>Anyhow, I really like the "fine tune" ability of the helical focuser.
>
>And yes, it is a pain when switching non-parfocal eps.  I'm not
>set up with a spacer tube to make them parfocal -- I just unscrew
>it a fair amount.
>

>(If I could just figure out how to hook a motor drive to my helical
>focuser... B^)
>
>jeff
>
  
The old focuser made by Telescopics ( out of business for many years)
was the best on the market in the 1970's. It was a rack and pinion
type but your could turn the focuser tube to use it as a helical
focuser also.  Best of both worlds. No dead spot either. A good
idea that is history.

Bob Pfaff