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You don't say how well you had aligned the mount and whether or not the mount has goto tracking capability. I did exactly what you are doing back in march with the same results. without the barlow you will get away with rough alignment and just tracking. With the barlow you will need either to have goto tracking the planet for you (after a three star alignment) or you will need to have done a reasonable drift alignment. The fact that the mount can rotate to match the earth's movement will not keep the planet in the centre of the field of view if it isn't aligned. Sorry if I am stating the obvious.
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