Doug, good question, and no mate, I'm not disappointed at all, I just wondered why they had those lovely concentric rings in them.
To perfectly honest I didn't really know what to expect, however, having said that I did think that the master flat after conversion and combining would stay the same colour as the original raw frames taken.
It did surprise me to see them come out of the processing sequence as very dark nearly black appearance, but I presume this is normal.
Doug you must understand, I have not done this sort of stuff for all that long, but am still learning every day, this certainly has been an interesting episode, and that is good, as I have learned something, I think.
As said earlier Doug, there is no apparent problem applying these flats to the lights, and the final image is fine.
So I will accept that this is how it is supposed to be, unless told other wise.
Thanks.
Leon