Ha & OIII comparison in the Crescent nebula

After capturing 101x1800s combined in Ha and OIII for the Crescent nebula, I thought it may be of interest to show a comparison between the two lots of data.

I know that the outer halo is something of a difficult capture and it really does only show up in OIII........ The comparison is 50x1800s in Ha and 51x1800s in OIII. There really is some quite pronounced differences.