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M42 (another) reprocess BUT this time with Pixinsight!


blinky
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Craig, to get away from the effects of coma, choose stars near the central 1/4 of the fov to gauge roundness.

If there is a tilt of the camera to the focal plane, the stars on one side of the image will be different to those on the other side, and probably out of focus a little too at F4.

Be interesting to see how the stars at the start of the session compare to those at the end.

BTW, when you start analysing something as easily fixed as star shapes, you KNOW the image is good :icon_scratch:

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