Picture saved with settings embedded. Published March 24, 2017 at 1318 × 1080 in First Light ← Previous Next → Rosette Nebula in Ha | William Optics GT81 + ZWO ASI 1600MM-Cool & 0.80 focal reducer guided | 15 x 180 secs + darks & bias calibration Gain 300, Offset 10 | 21st March 2017