Dire Traits

[The Thing]

That's starting to look very nice Mick.  It's going to be clear again tonight , maybe you can get some more subs. I am jealous of the FoV, I can only get two of them in an image at a time!

[mickw]

Thanks I'm a bit happier with the result now I've found I can use what I have done.  I'll definitely revisit the others.

I've not knowingly done "calibration" before, I just slap lights, darks, flats etc together then tinker in Photoshop 
What should I have been doing or what is done in calibration ?

Duncan unfortunately South is where kitchen lights go on at random, I don't stand a chance until after midnight when the good stuff usually disappears behind houses or the full moon pops up 
I am set up though and prepared for a attack of North

[Fay]

yes put them all together before processing

[mickw]

yes put them all together before processing

Blimey, I was doing something right 

The reason I tried the stretch before stacking was that stacking pushed the black and white points all over the place.  The histogram showed the black being clipped to maximum, doubt whether that's the right description but the histogram did not slope, it was vertical and only sloped down to half height on the right.

[Fay]

Once you use levels in PS the histogram will look better