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I still had the issue the other night however I was able to minimize the extent of the halo by aiming closer to the bright star.
I took a couple exposures at 800 iso, I'll take some more in the future at lower exposures to gain more detail around the core and to bring out the trapezium.
I took some test shots of NGC 253 the other week with the same optical train without issue but there were no stars as bright as the ones in frame for M42.
Could my sensor being well past the correct backfocus distance be my issue?
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