![astrofotografie, astronomie, astronomy, astrophotography, b&w, black and white, bw, cave nebula, cepheus, emission nebula, emissionsnebel, fotografie, kepheus, photography, schwarzweiß, sh2-154, sh2-155, sharpless, sw](https://photo.m-j-s.net/blog/uploads/2021/11/sh2-155_ha_v1-sharpless_154_and_155_cave__nebula_-_ha_bw_-_nov_2021_v1.jpg)
![astrofotografie, astronomie, astronomy, astrophotography, auriga, b&w, black and white, bw, emission nebula, emissionsnebel, fotografie, ic, ic417, m38, messier, ngc, ngc1907, ngc1931, photography, schwarzweiß, sh2-234, sh2-237, sharpless, sw](https://photo.m-j-s.net/blog/uploads/2021/11/ic417_ha_v1-ic_417_emission_nebula_and_friends_-_ha_bw_-_nov_2021_v1.jpg)
A completely clear night – not that many of them lately – provided several hours of H-alpha to catch the nebulosities above. Meanwhile I switched from the Optolong LRGBSHO filter set to the new Baader CMOS-optimized filters. At least H-alpha seems to work better in the combination with the Esprit 100 ED and QHY 268M, but still some problems with the flats.
See Astrobin here and here for details.
![astrofotografie, astronomie, astronomy, astrophotography, b&w, black and white, bw, cave nebula, cepheus, emission nebula, emissionsnebel, fotografie, kepheus, photography, schwarzweiß, sh2-154, sh2-155, sharpless, sw](https://photo.m-j-s.net/blog/uploads/2021/11/sh2-155_ha_v1_annotated.jpg)
Backyard astrophotography in light-polluted Cologne-Dellbrück (SQM 19.8)
Skywatcher Esprit 100/550 ED, Skywatcher Flattener, Baader CMOS-optimized Ha 6.5nm / QHY268M
OAG with Lodestar X2
Mount AZ EQ6 GT
Image acquisition: CdC, NINA, PHD2, dithering
Ha: 26 x 600s, mode 1, gain 56, offset 10, -5C, 20 flats, 50 bias, 20 darks
Data calibration/integration: PixInsight
Image processing: PixInsight, Lightroom
![astrofotografie, astronomie, astronomy, astrophotography, auriga, b&w, black and white, bw, emission nebula, emissionsnebel, fotografie, ic, ic417, m38, messier, ngc, ngc1907, ngc1931, photography, schwarzweiß, sh2-234, sh2-237, sharpless, sw](https://photo.m-j-s.net/blog/uploads/2021/11/ic417_ha_v1_annotated.jpg)
Backyard astrophotography in light-polluted Cologne-Dellbrück (SQM 20.0)
Skywatcher Esprit 100/550 ED, Skywatcher Flattener, Baader CMOS-optimized Ha 6.5nm / QHY268M
OAG with Lodestar X2
Mount AZ EQ6 GT
Image acquisition: CdC, NINA, PHD2, dithering
Ha: 19 x 600s, mode 1, gain 56, offset 10, -5C, 20 flats, 50 bias, 20 darks
Data calibration/integration: PixInsight
Image processing: PixInsight, Lightroom