Paper on all the errors causing oblong stars in astrophotographs


I posted the attached paper to CloudyNights a couple of years ago I think and since we have had a few discussion about how our mounts contribute to or detract from that perfect star image, I thought it might be good to revisit this paper and update it based on what I have learned the past couple of years.

Let me know you thoughts and we can discuss it so that I can make it better.


Jerry Hubbell
Director Electrical Engineering
Explore Scientific, LLC.

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