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As amazing as the Seestar is, if can't do everything, mainly because the field of view is only slightly larger than a full moon. Here are a few things that come to mind:
• It can't give your great images of planets. Because the focal length is so short (250mm) even large planets like Jupiter1) and Saturn are just tiny dots. With some effort you can create a decent (but small) image of a planet.
You can see Jupiter's Galilean moons 2)
Jupiter's dark “belts” and lighter “zones”
• It can't track the ISS. It moves too fast. But with a little preparation3), you can catch it as it flashes past the sun (or moon)
• It won't capture meteors during a meteor shower. They move too fast and appear across a wide sector of the sky
• It can't image the Milky Way. Looking out at the edge of our galaxy shows just how huge it is. It covers a wide swath of the night sky