Vent: Spent years stacking photos wrong after a talk at the Griffith Observatory

I was at a talk at the Griffith Observatory 2 years back, and the speaker showed how he layers his deep-sky images. Turns out I had been stacking my nebula shots with the wrong calibration frames the whole time, just using darks and not bias frames. A guy next to me pointed out my Andromeda shot had a gradient from the sensor noise I wasn't removing. Anyone else realize they were skipping a calibration step for way too long?

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