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Astrophoto: M39 Clear Skies 23+24

October was my flattener-config-hell. M39 was shot with unfinished config, but still to nice to throw it away.

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:

Messier 39

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:

Flattenertest Astrophoto M39 Clear Skies 23+24
Flattenertest Astrophoto M39.

Technical overview of Astrophoto M39 Clear Skies 23+24

TelescopeVIXEN ED80sf
Focal Length600mm
Aperture ratio7.5
Erecting LenseTSFlat2
Filter
MountSkywatcher HEQ-5
Goto-ControlEKOS
Mount ControlINDI
Guiding Scope Focal Length162 mm
Guiding Camera Chip4.8mm x 3.6mm, 8bit
Guiding Camera Resolution1280×960
Guiding SoftwareEKOS, INDI
Dithering3 pixel
CameraCANON EOS M100(a)
Methodfocal projection
Camera ControlEKOS, INDI, Gphoto2
Photography Date 10.10.2021 and 24.10.2021
Exposure-Time Lights48x180s
SensitivityISO 400
CalibrationframesFlats, Bias
Post Processing Date23.12.2021
Stacking, IntegrationAffinity Photo
Post Processing SoftwareAffinity Photo
Image EditingAffinity Photo
Capture PlaceKoblenz, Germany
LightpollutionBortle 5
Scattered lightstrong

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