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Looks like this is turneing into a bit of an equipment discussion, but here is a photo of my RH200 with the STI mounted on top. It's solid. No moving parts. 1 hour sub exposures no probelm. This was not the case before I added the rings, replacing the single arm base plate that came with the original unit.
The need for the rings was necessary to eliminate flexure.
The STL also has internal guiding which I have tested with no difference between the STI guidescope or internal off-axis guiding.
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