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Thanks for the replies.
I wonder how far you can push things here?
For example, could you capture DSOs using an alt az mount, large aperature, field rotator, wide field of view, and many shorter exposures stacked. Downside is read noise obviously.
I guess it all comes down to the granularity of the drive impulses. It won't be a Single gear turning at sidereal, but two gears turning at variable speeds to try to achieve the same thing.
Markus
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