[APML]: Barn doror tracker

["C. Hernandez" <herdel@sol.racsa.co.cr>]

You wrote to Jim:
> 
> Consider building a barn door tracker for some great pictures up to 10 
> minutes long!

Dave:

Would you mind to share this barn door tracker idea with me? I have been
looking for some kind of motorized driver, both for my 4.5" relector and
for my photo camera. Could this kind of tracker work on any of them?
Give me some light.

Thanks,

Carlos Hernandez
Heredia, Costa Rica