[ATM] Focuser, Derotator, Off Axis Guider

[martin.cibulski@t-online.de]

Hi,

I plan to take photographs with my 14" dobson telescope.
Because of the field rotation the best guiding solution 
seems to be an off axis guider.
Using a secong telescope for guiding is more complicated
because this scope has to be rotated too and the rotating
assembly must be very precisely parallel to the main scope's
optical axis.

So I need
1. field derotator around the focuser
2. off axis guider
3. low profile focuser with extension for viual use
. . . very expensive.

I think it should be possible to build a focuser with integrated
off axis guider. The the guider doesn't need additional backfocus.
If a derotator is already there I could seek for a guide star
by rotating the whole focuser instead of rotating the OAG alone.

The focuser housing around the tube must be open to one side to
allow the second tube of the OAG to be mounted.


Any thoughts ?

Regards,
Martin Cibulski
http://www.martin-cibulski.de/atm
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