Thanks Rob and jjj.
Been a very difficult road this AGing,so just pleased to get an image like this.A few more subs would have been nice.I'll look at the feature you mention jjj in DSS,still very new to it.Although what you mention may be well beyond me.
I hope I get a chance to collect more images tonight,but its very windy,and a few clouds that could stormy,and the moon is making more each night
,just when I finally look like getting somewhere.
I used a Canon 450D for this image rather than 50D,doing the dark frame adjust in DSS gets rid of amp glow,and I figure is there is a derailment,I'd rather the 450D go off,than the 50D which I will now just use for birding and regular photography-really cannot see much difference for night photography.