Siril

Bias/offset#

inherent noise of sensor Can be taken once and used for months Temp doesn't matter very much for most cams Take 20-40 frames with lens cap on, shortest exposure available, same ISO

Open Siril, set work dir, add all raws, convert (no debayer /!, keep all channels) Then stacking > median stacking, no normalisation

Dark#

Thermal noise during or After shooting (temp important), same params but with lens cap on

Open Siril, set work dir, add all raws, convert (no debayer /!, keep all channels) basic: Then stacking > median stacking, no normalisation most optimal : average stacking with rejection, no normalisation, Winsorized sigma clipping (if rejection ends up > 0.5%, fall back to median stacking, no norm)

Lights#

Simple photos of the object In siril, change dir, set seq name, convert WITH debayer Registration: registration method "Global star", else don't change settings

Comets#

Sources#

basics: https://www.youtube.com/watch?v=qYXd0rrAzjg pre-process: https://www.youtube.com/watch?v=RswLpEE7EZ4 https://free-astro.org/index.php/Siril:Tutorial_preprocessing