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No worries. Thats why I went for the OAG. I was getting flexure with a guidescope as the scope only has a rather thin sheetmetal tube. Ive done up to 20 minute subs without any trailing. Polar alingment does need to be pretty spot on, as Im guiding on stars well away from the optical axis so any field rotation would show up more. The good thing about this OAG is the pick off prism sees totally unfiltered starlight, handy when using narrowband filters for imaging.
Scott
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