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Hi Riklaunim and Brendan,
Thanks for your input and advice.
I am aware of the the rotational issues with the altaz mount and can see why a still camera needs an equatorial mount. This is why I was looking at video capture. I have been lead to understand that with a number of single frames, these can be stacked and de-rotated in software. I think there are cameras with built-in frame integration and de-rotation. Alternatively, I understand that this be done by software eg Registax, after capture.
If video cameras aren't for DSOs, why are they advertised as "Deep Space Imagers"? I seem to be missing out on some piece of knowledge or logic, but I don't know what. Perhaps its just quality of image, related to the size of the CCD. I'll certainly follow up on the gstar-users link. I'll also check out Starizona - thanks Mark.
Thanks,
Robert
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