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Yes as Stephane mentioned camera in same orientation and “Focus”
If camera moved or removed a new set of Flats should be taken eg: 2 nights imaging with camera removed and re installed 2nd night
I use a fresh set of Flats and Bias for each session even though you can reuse Bias
I’ve had issues with DSS and using Masters so I use a fresh set each session , haven’t had any issues to date
They don’t take long to capture anyway.
DSS loading Calibration Frames ( safest option )
1 nights imaging
Load Lights, Flats and Bias into Main group register and stack
2 nights imaging ( camera removed )
Load night 1 Lights , New Flats and New Bias into Main Group
Load night 2 Lights , New Flats and New Bias into Group 1
Register and stack
2 nights imaging ( camera not removed )
Load night 1 Lights, same Flats and same Bias into Main Group
Load night 2 Lights , same Flats and same Bias into Group 1
Register and Stack
NB: I’ve tried the reference frame method for multiple nights in DSS and it’s never worked for me
One important thing I do before loading Lights into DSS , I review the light frames in ASTAP and cull any lights with the following issues -
Bloated stars due to Ra or Dec excursions in PHD2 guiding
Tracking or guiding issues ( Star shape ) zoom in for inspection
Satellite trails
Aircraft trails
Cloud cover even high cloud ( Astap will pick it up )
Other anomalies
Cheers
Martin
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