Sigma clipping

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#581080
Paul Leyland
Participant

Sigma clipping destroys photometric accuracy.  If all I want is a pretty picture I tend to use median stacking but for scientifically useful images that’s only an option for astrometry.

I use 30s subs, so bad images can be discarded with out losing too much data, but need to use arithmetic mean co-addition for the great majority of my work.