Thanks for the encouragement all. I knew it would not be easy but never expected it to be as difficult as it really is.
There is a huge learning curve when everything is totally new.
On the plus side this system peforms even better than I expected. With a lot more practice it will do even better when I get up to speed. It is a bit like going from a go-cart to an F1 car. Without the practice in the go-cart I would most probably be still sitting at the start line stalled or crashed.
I dug up some OIII data to add to this NII and HA.
This is NII to red channel,Ha to green and OIII to blue. 5MB
http://d1355990.i49.quadrahosting.co...HAg_OIIIb_.jpg
I hope to do more like this to find interesting regions in the Vela SN remnant and many others. The relatively wide field means I can cover a lot of territory. This will give information to the people with longer focal lengths and fast systems an idea where to put in a major effort to capture the really dim 'interesting' stuff that does not normally get imaged.
The real advantage of 3nm narrow band imaging is that it can be done even with a full Moon. So all those inevitable clear nights with a bright Moon will be useful.
We used to have a saying at my last workplace 'if you are not making mistakes you are not trying hard enough!'
Bert