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Hello All - Star Image Sizes

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Hi All - Star Image Sizes

Hi All - I've just taken up astro again after 30 years away doing physics. I hope I will be able to contribute to the lounge when I've had more experience in future. I'm mainly interested in equipment and astrophotography. Currently I have a Meade 4504 but am using the goto mount with a Canon 500D and various lenses to start. I have a beginner's question: All stars are point objects irrespective of their brightness. I thought the image size of a point object is the Airy Disc size and does no
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