This was a hard one to process. Most of the data comes from January this year, but the seeing wasn't quite as good as I would have liked. Fortunately I had some good data from December 2013 taken with my QSI camera over a much smaller field of view than with my current setup. The seeing then was good enough to almost get 6 stars in the trapezium. They appear as bumps on the brighter stars, so I used that data for the central region.
http://www.astrobin.com/291646/B/
Higher res here
http://www.astrobin.com/full/291646/B/
Details:
Telescope: 12.5" PlaneWave CDK
Cameras: FLI 16803, QSI 540 wsg
Mount: AP900
Exposures:22@20s (QSI),
22@150s, 12@250s, 20@600s (FLI)
total 5.2h
Dates: Jan 2017, Dec 2013
FOV: 49' x 49'
Processing: PixInsight.
Geoff