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Hi
Sirius A is grossly over exposed in order to bring out the much fainter Pup, Sirius B. If I set the optimum settings for Sirius A alone, it would look something more like the following example of Eta Orion, where you can see the Airy pattern.
I would probably have to expose at around 1/1000 to 1/2000 sec to avoid Sirius A from saturating and “blobbing out” to the extent it did.
Cheers
Dennis
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