At last, after many many clouded nights we had some clear skies recently, and I managed to put to test Astrodon 3nm Ha filter. I live very close to Brisbane's CBD so I was curious whether this filter will offer any improvement over 12nm one I have been using before.
Integration:
3nm Ha: 28 subs 120 sec each
12nm OIII: 12 subs 120 sec each
12nm SII: 12 subs 120 sec each.
Full resolution image:
http://www.astrobin.com/141089/
Few details still require attention, but otherwise I am quite happy with the final result.