[APML] Computerized Barndoor Tracker

[Chris Brown <chris.brown@zetnet.co.uk>]

> Hello!  I’d like to get some more information regarding computerized
> Barndoor Trackers.  As I develop my 4x5 inch camera, it seems that exposures
> will need to be 10 to 30 minutes in duration.  I thought I would try a
> single arm barndoor tracker instead of piggybacking it to my 8 inch LX200.

 Why computerise it...depending on the focal length you could hand power
the mount.
Failing that a DC motor with a couple of plastic gears works just as well.
In fact if you use a curved bolt you do not get the divergance from
accurate tracking that you get from a straight bolt.

Have you published plans for your 4x5 camera...in there a link???

Chris



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