Rosette Nebula – first deep sky project – March 2021

2023 reprocessed picture of Caldwell 49, the Rosette Nebula, based on the data from 2021.

Two important evenings for me. I had a lot of time for exposures and collected a lot of data, but the result shows where to focus on in the next months.

Astrophoto NGC 2237 Rosette Nebula Clear Skies 8+9.
I had two really nice evenings working on the Rosette Nebula. No real problems and in the end i was quite happe with the final result.

On this astrophoto the used EOS camera was not yet astromodified. I really like the version of this nebula much more with the OWB filter installed than the pictures without.

Lessons Learned

I collected a lot of light and stacked and processed it afterwards. I was quite happy with the results and the response on social networks were awesome. Now, with a look back there are a lot of problems to work on in the next months.

  • A lot of noise!
  • So i need even more photons.
  • longer exposures
  • dithering – something i started reading at.

I still was struggling with the bad support of my CANON M100 in the astrophoto tools.

High resolution on Flickr:

Rosette Nebula (Caldwell 49 / NGC 2238), Emission Nebula, Astrophotography
The high-resolution image on Flickr, with plenty of additional information.

Session details

TelescopeVIXEN ED80sf
Effective focal length600 mm
CameraCanon EOS M100
MountSkywatcher HEQ5 Pro
Guiding equipmentTS-Optics 50
Guiding cameraOmegon 1200b
Date of capture5 March 2021
6 March 2021
Nights2
Exposure (lights)85 × 150 s
Total integration3 h 33 min
Calibration framesFLATS, DARKS, BIAS
SensitivityISO 1250
Capture setupWindows, Cartes du Ciel, PHD2, iOS, CC&C
Processing8 March 2021 — PixInsight
Reprocessing27 May 2021 — Affinity Photo
Reprocessing20 December 2021 — Affinity Photo, SiriL
LocationKoblenz
Focal ratiof/7,5
Image scale1,28 ″/px
Field of view128,0 × 85,3 ′

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