Margins after stacking

[Scooot]

I've taken about 200 subs and stacked them in pixinsight with drizzle data. Below is an auto stretch after using Dynamic Background extraction on it. My polar alignment was out on the star adventurer so I had quite a bit of drift whilst imaging, so I think this is why I have the stronger signal in the centre of the image. Does anyone know if there is anything I can do to recover the image so I can use the whole fov or do I just crop off the edges? All help welcome http://pixinsight.com/forum/Smileys/default/smile.gif
 

[Alejandro Tombolini]

Hi Richard, with 200 sub I would have expected a better background but maybe you took short exposures.
Try using Blink tool on the registered images to see if there are subs too moved respect to the reference image that could have caused that.
Saludos, Alejandro

[Scooot]

Thanks Alejandro

They were only 30 second exposures on iso800, I was using my star adventurer unguided and my polar alignment was out but even if I'd aligned it accurately I'm not sure how much longer I could take without star trailing.

I'll try the blink tool as you suggest. Someone has also suggested on SGL I use a mask and try the canon banding script, so I'm just trying to work out how to mask the strong area to try that