Take a series of flats covering the whole flux range, always two flats per exptime, and if possible with low exptime (to avoid dark). Also take bias exposures to subtract.
Do this with the flat panel? Maybe better dome flat, to avoid any LED issues here.
Take a series of flats covering the whole flux range, always two flats per exptime, and if possible with low exptime (to avoid dark). Also take bias exposures to subtract.
Do this with the flat panel? Maybe better dome flat, to avoid any LED issues here.
Analysis using the variance computed form the difference between the flat pairs: http://spiff.rit.edu/classes/phys445/lectures/gain/gain.html
https://www.mirametrics.com/tech_note_ccdgain.php
General resource: https://www.aavso.org/ccd-camera-photometry-guide