I use a light panel for taking flat.
RGB flats are pretty straightforward, and the default settings work well
H is ok if I increase the default max exposure a bit.
O and S however I seem to struggle - quite often the process fails.
I think it has to do with the min / max setting but I have min at 1 and max at 50s and it still fails.
I suspect it is the light source?
How do you take your NB flats? What with and with what settings?
After lots of trials and errors, for my fast newt this works:
O 0.1s min, 10s max; S max = 50; and H max = 15.
It seems that my light source is very rich in O and very poor in S.
Is there a better panel to use?