NGC 6823

Temperature +18°C. 3-hour window, sun at -15 degrees below horizon. Offset 10, -10°C. 50 darks, 50 flats, 50 dark flats. No Photoshop, just stacking, brightness, and white balance. Tracking adjustments each frame. Yellow zone light pollution, 14 km from the city of Kazan (population over 1 million).