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do tube currents move the image or fluxuate the image bigger / smaller etc?
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From my experience, the tube currents can give the appearance of bad seeing. ie Distorting the shape of the image and making it wobble about as well.
If i'm planning to get up early in the morning for some imaging, I leave the scope out (dust cap off) overnight under the pergola so that it's all cooled down and is at ambient temperature.
I did that overnight last night, with a view to imaging Saturn this morning, but was foiled by clouds.