The Clear Sky Sessions
Astrophoto M39 Clear Skies 23+24.
I shot several photos, more than i remembered, from M39 on two of those evenings in october when i tried to configure the flattener.
Here the high resolution astrophoto on Flickr:

Lessons Learned
What i learned is, that my next refractor will be a flat field refractor!
even if the final astrophoto looks somewhat nice. A closer look to a single exposure shows that i did not yet found the best distance between flattener and sensor. Especially with a look into the corners:

Technical overview of Astrophoto M39 Clear Skies 23+24
Telescope | VIXEN ED80sf |
Focal Length | 600mm |
Aperture ratio | 7.5 |
Erecting Lense | TSFlat2 |
Filter | – |
Mount | Skywatcher HEQ-5 |
Goto-Control | EKOS |
Mount Control | INDI |
Guiding Scope Focal Length | 162 mm |
Guiding Camera Chip | 4.8mm x 3.6mm, 8bit |
Guiding Camera Resolution | 1280×960 |
Guiding Software | EKOS, INDI |
Dithering | 3 pixel |
Camera | CANON EOS M100(a) |
Method | focal projection |
Camera Control | EKOS, INDI, Gphoto2 |
Photography Date | 10.10.2021 and 24.10.2021 |
Exposure-Time Lights | 48x180s |
Sensitivity | ISO 400 |
Calibrationframes | Flats, Bias |
Post Processing Date | 23.12.2021 |
Stacking, Integration | Affinity Photo |
Post Processing Software | Affinity Photo |
Image Editing | Affinity Photo |
Capture Place | Koblenz, Germany |
Lightpollution | Bortle 5 |
Scattered light | strong |