Quote:
Originally Posted by Paul Haese
Robin with faint stuff I have been using median on the RGB which is binned 2x2 the my lum which is 1x1 I am generally doing summed with long deep subs. 20 minutes or so is the best bet on dim objects. It might not suit each persons setup though because of mount issues or light pollution. However, I find for my location I can go quite deep without causing any real issues.
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The beauty really of median combine is it reduces noise. It fades out the satellite trails, gets rid of the cosmic ray hits etc. Sum does not. Its accumulative whereas median is averaging. So one image with a high number in one spot not on the others caused by noise gets reduced with every extra image taken. Some people like sum. It probably gives absolute maximum resolution but only if your subs are pretty clean or you use the healing tool more to clean up artifacts at the end.
Greg.