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Rolf,
FWIW, I seem to get no noticeable difference in diffraction with a set
centred on NGC2822 and Miaplacidus offset, and a second set centred on
Mia.
See attached.
1st image was 150 frames centred on the galaxy.
2nd set is 65 frames centred on Mia.
Oversharpening applied to both images to emphasise the spikes.
Tonight was a good night to test this, seeing is very steady.
Steve
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