Back on April 21st, I captured an image of the Whirlpool galaxy (M51) and processed it without any calibration frames as I didn’t have flat frames that night. I took some flat frames on the following morning but forgot about it. Finally got around to use a full set of calibration frames (dark, flat and bias) and the result is quite remarkable. Just needed that extra hands-on validation to keep using calibration frames in my workflow.