Your right Ian,
Thanks for your patience.
I had been playing with various files and I felt sure that I had read one that stated that it did not conform.
Obviously not that one. That’s great. Have moved forward another small step.
I think my worry was that maybe I had done something wrong.
I was expecting to have an output of master flats, master darks and master flat darks and then having to do something with them.
Subtraction I assumed.
So the image it outputs, is that a calibrated image? Is it possible to tell?
What does the software do to the original uncalibrated lights?
I have no feel for what’s going on under the bonnet.
Thanks
Kevin