Thank you all for your very kind feedback. The truth is I did not expect that I will manage to "paint" this nebula with different colours - it is very strong in Ha, has decent S2 but it turned out there was very little signal in O3.
It is not as sharp as I would like; there was some backlash in the mount in both axes (now I have eliminated it) and on a few occasions dew started forming on the lens - I will need to get dew controller and a heater...
I was hoping to collect more data but some people of this forum (not pointing fingers at anyone in particular...) have been recently buying telescopes and good weather has ended
Starless version? Hmmm, for some strange reason I actually do not like very much starless images of the nightsky, as they seem to me to be hollow and dead.
Instead of removing stars, I have corrected colours a tiny bit - there were some subtle gradients that I did not like...I recon it will have to go on aluminium!
http://www.astrobin.com/full/201490/B/