Quote:
Originally Posted by gregbradley
What was the equipment you were using?
At first glance it looks a bit like the images are not aligned properly.
Median combine is the best method for combine as it will get rid of many artifacts.
Sigma clip may be fine if you have enough subs for the maths to work. It assumes quite a few subs being worked over.
Greg.
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Greg
the scope was an FSQ106 and CCD was a SBIG STL11000M.
The odd thing is that the stars are well aligned - I tried both Astrometric and Star Matching in Maxim - it doesn't show up well in the screenshots I posted but the stars are fine, its the imperfections in the sensor response to the R vs G/B frames that don't match. I also tried combining with median, sum and average for the same result.
Word from iTelescope is that the darks may be as old as October - they plan on redoping them and having another crack at calibration with new master darks. I'm hoping that sorts it.
Pete