NGC 2237/38/39/44/46 Rosette Nebula and Open Star Cluster (Theli RGB UCAC4 v3)
Balcony astrophotography in light-polluted Cologne-Dellbrück (19.5 mag/”2, worse at low altitude)
William Optics GT 81 FD 478mm f/5.9, IDAS LPS V4, TSFlat2, Canon 5D Mark II (a)
Mount AZ EQ6 GT, WO Guiding Scope 50mm f/4, ALccd QHY 5L-II mono
Dithering with BackyardEOS and PHD2
33 x 600s ISO 800, 20 flats, 50 bias, 17 darks
Image processing using Theli, UCAC4 calibration, STIFF, Photoshop, Lightroom