Quote:
Originally Posted by Merlin66
De-rotators (for non-Meade SCT) were discussed a few months ago.
They are NOT cheap (I think around $3500) and need some sort of Alt-Az signal/input to do the necessary calculations/ corrections.
So you'd need a Alt-Az readout cum controller before you could even consider adding a de-rotator.
Not an easy solution......
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Mel Bartels' software (freeware, stepper motor design) supports de-rotator.
http://www.bbastrodesigns.com/BBAstroDesigns.html
For the mechanically oriented DIY individuals, de-rotator design and build is not such a big challenge.
I remember seeing some interesting designs on CN forum.
There are also some discussed on Yahoo scope group.
However, the eq platform for dobsonian may be the better (cheaper?) option, as it needs tracking along only one axis (polar), compared to 3, required for dobsonian.