Two magic screws of the telescope focuser
The question of star shape at the corners is always a sore point, and I'll show you how you can significantly improve the results with standard tools.
For my wasted years...
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My astro photos will be here: https://deepskyhosting.com/justvolkov or
https://telescopius.com/profile/kamer... or https://www.astrobin.com/users/justvo...
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