Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  M 13  ·  NGC 6205
M13, Jonny Bravo
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M13

M13, Jonny Bravo
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M13

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Description

Goofi's imaging challenge for June, 2022.

I imaged M13 last year with my 0.8x reduced GT81. This year, I decided to try it using my 8" EdgeHD natively at f/10. I've been struggling with the new setup. Funky artifacts on bright stars, chromatic aberration, tilt, tracking problems, etc. I have gotten the system to a semi-decent place now, but I still have some concerns with it.

Tilt I've mostly eliminated. Spacing is pretty good. I still get the bizarre artifacts on bright stars - almost looks like pinched optics. Chromatic aberration is much less pronounced without the 0.7x reducer in the imaging train. RA guiding error is still typically twice that of Dec guiding error, so my stars are still elongated a bit.

I'm pretty happy with the result of this data, all things considered.

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M13, Jonny Bravo