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Orion issue is flaring from the bright star at the edge. See it all the time. Best to position the shot so bright stars are NOT at the edge of FOV.
The other image shows either tracking issues (need to see the ENTIRE image), flexure/sag/tilt or a not-flat field. Some reducers do NOTHING to mitigate field curvature, whereas some of the better, more expensive ones both flatten and reduce. Show the entire shot, including all corners, and this can be nailed down more
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