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I’ve had quite a few fights with star comets using the celestron oag along with edge8 / 0.7x reducer. I’ve found that it is influenced by spacing and gets much worse if I deviate too much from what’s recommended. I’ve hit a bit of a sweet spot now but even when the oag guide stars looked aweful, the star shapes on the image were better thann using the guide scope (even though the guide scope guiding graph was better!)
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