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I agree with Barry....
If the star is wobbling in the OAG FOV then I'd expect the stars to be wobbling in any image you take....
Could be seeing conditions, or some mechanical factor.
A good guide camera or a good OAG will give you results second to none.
I use PHD2 (and AstroArtV5) for guiding with an on-axis guider (reflective slit spectroscope) on a C11 at f10 using the Lodestar and can easily get ten minute subs on a 20 micron gap.......
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