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If the spacing between your flattener and the camera sensor is too long, the stars will be tangentially elongated. If the spacing is too close, the stars will be radially elongated.
Your flattener-sensor distance is evidently too close, as your stars are radially elongated. Check the flattener manufacturer's spec to see what the correct spacing is and add a spacer. Or do what Jon and I both did - get Joshua to make a custom adapter that is exactly the right length.
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