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Nice device, but does the app have the ability to review the pictures taken with the camera on the much larger Android screen ?
That would be a great help on focusing. I do that with DSLR Controller over USB (CR2 files over wifi is way too slow), while using the 26 years old Super Polaris as tracking device which tracks neatly up till 600mm and 4 minutes with the Canon 6D without guiding.
The Star Adventurer Mini cannot handle my ED110, but it can carry my 6d+70-300L and even the new 100-400LII (which I don't have). Both lenses are very sharp in the edges at full aperture, like the 200/2.8L.
The polar scope should just find BQ Octantis (+6.9) (not Sigma which is too far off the Pole!) which can be put into the center of the field and that is accurate enough.
I did that sucessfully with my Vixen SP and had no tracking errors at 600mm and 4 minutes.
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