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The problem isn't that it doesn't track well enough (I don't know to be honest how accurate the tracking is long-term), the problem is HOW it tracks. For imaging you need an equatorial mount. Briefly - you point one axis at the north star and it doesn't move. The telescope is then tracking true celestial movement instead of both left/right/up/down (right ascension/declination). Moving in two axis simultaneous, as you get further from the north celestial pole the images will be blurred from the movement.